Finding references
MathSCInet
the EUropean Digital Mathematics Library
arXiv.NT / arXiv.AG
Free textbooks approved by AIM
Open Math Notes
Some websites related to number theory
Number Theory Web
Online seminars all over the world
KIAS Number Theory Seminar
KIAS Algebra Seminar
BU Number Theory Seminar (BUNT?)
Harvard Seminars
MIT / BCMIT / STAGE
UCI Number Theory Seminar
Conferences in Arithmetic Geometry
SAGE / SAGE Questions
Drawing Fundamental Domains (using JAVA)
Barry Mazur's teaching archive
Ravi Vakil's lecture note on algebraic geometry (postHartshorne?)
Johan de Jong's stacks project (postEGA?)
The automorphic project
A translation project for EGA
Mixed Hodge module project
Some Video Lectures
Kevin Buzzard's lectures on automorphic forms at MSRI
Math in Russia
Potential Modularity, 30 October 2009 at INI, UK
NonAbelian Fundamental Groups in Arithmetic Geometry at INI, UK
Algebraic Lie Theory at INI, UK
The stable trace formula, automorphic forms, and Galois representations  Summer School, Banff
The stable trace formula, automorphic forms, and Galois representations  Workshop, Banff
École d'été sur la conjecture de Birch et SwinnertonDyer
Ted Chinburg's Class Field Theory : 620, 621, 720, 721
Dick Gross's course on undergrad algebra
Some Nearby Math Institutes
Research Institute for Mathematical Sciences, Kyoto, Japan
Morningside Center of Mathematics, Chinese Academy of Sciences, Beijing, China
Beijing International Center for Mathematical Research, Beijing, China
Shanghai Center for Mathematical Sciences, Shanghai, China
National Center for Theoretical Sciences, Mathematics Division, Taipei, Taiwan
Yau Mathematical Sciences Center, Sanya, China
Miscellaneous Stuff
Math Overflow
LaTeX Questions
PhD Comics / xkcd / math with bad drawings
TED
"I Love You!" in Different Languages
Proofs of the Quadratic Reciprocity Law  more than 200!
Mathematics Genealogy Project
Some stuff for math nerd
Some coffee documentaries
Some people in number theory and algebraic geometry
Avner Ash /
Jennifer Balakrishnan /
Kenichi Bannai
(Bannai Lab) /
Joel Bellaiche /
John Bergdall /
Gebhard Boeckle /
David Burns /
Kazim Buyukboduk /
Anna Cadoret /
Bryden Cais /
Byungchul Cha /
Sunil Chetty /
Masataka Chida /
Przemyslaw Chojecki /
John Coates /
Pierre Colmez /
John Cremona /
Samit Dasgupta /
Henri Darmon /
Luis Dieulefait /
Tim Dokchitser /
Matt Emerton /
Olivier Fouquet /
Cameron Franc /
Toby Gee /
Matt Greenberg /
Ralph Greenberg /
Dick Gross /
Alia Hamieh /
Takashi Hara /
Rob Harron /
Florian Herzig /
Haruzo Hida /
Ben Howard /
Tom Hulse /
Bohae Im /
Naoki Imai /
Adrian Iovita /
Tetsushi Ito /
B.D. Kim /
Myoungil Kim /
Guido Kings /
Shinichi Kobayashi /
Masato Kurihara
(Kurihara Lab) /
KaiWen Lan /
Chong Gyu (Joey) Lee /
Min Lee /
Yingkun Li /
David Loeffler /
Alvaro LozanoRobledo /
Barry Mazur /
Yoichi Mieda /
Robert Miller /
Chung Pang Mok /
Kentaro Nakamura /
Yoshiyasu Ozeki /
Jeehoon Park /
Jinhyun Park /
Vincent Pilloni /
Rob Pollack /
Bjorn Poonen /
Cristian Popescu /
Kartik Prasanna /
Joe Rabinoff /
Ken Ribet /
David Roe /
David Rohrlich /
Karl Rubin /
Takeshi Saito /
David Savitt /
Romyar Sharifi /
Sug Woo Shin /
Andrew Snowden /
(Flor)Ian Sprung /
(George Alex)Ander Steele (The Fourth) /
William Stein /
Glenn Stevens /
Ramdorai Sujatha /
HaeSang Sun /
Lenny Taelman /
Yuichiro Taguchi /
Jacques Tilouine /
Eric Urban /
Jeanine van Order /
Nike Vatsal /
John Voight /
Shanwen Wang /
Jared Weinstein /
Chris Wuthrich /
Liang Xiao /
Go Yamashita /
Zhiwei Yun /
Sarah Livia Zerbes

Some Conferences and Workshops I've attended (and will attend)
I have almost complete scanned notes of the below events. If you are interested in those notes, shoot me an email.
Development of Iwasawa theory (in honor of the 60th birthday of Masato Kurihara), July 22  26, 2024, Keio University, Japan
Pan Asia Number Theory Conference 2024, July 15  19, 2024, Vietnam Institute for Advanced Study in Mathematics, Hanoi, Vietnam
Special values of Lfunctions, January 2  6, 2024, Sanya, China
Miniworkshop for young number theorists, November 10  11, 2023, KIAS (I'm an organizer.)
Galois Representations and Automorphic Forms, August 20  26, 2023, Bedlewo, Poland
Iwasawa 2023, July 17  21 2023, University of Cambridge, Cambridge, UK
Shimura Varieties and Lfunctions, March 13  17, 2023, MSRI, USA
Introductory Workshop: Algebraic Cycles, LValues, and Euler Systems, January 23  27, 2023, MSRI, USA
Algebraic and Analytic Aspects of Lfunctions, January 9  13, Sheraton Grand Incheon Hotel, Incheon
Instructional workshop on Iwasawa theory for automorphic forms (online), December 19  22, 2022, KIAS (I'm an organizer.)
The 2022 Pacific Rim Mathematical Association Congress, December 4  9, 2022, Vancouver, Canada
Elliptic curves and modular forms in arithmetic geometry (a conference celebrating Massimo Bertolini's 60th birthday), September 12  16, 2022, Milano, Italia
Elliptic curves and the special values of Lfunctions, August 8  19, 2022, ICTS, India (Online)
Summer School on the Langlands Program, July 11  29, 2022, IHES, France (Online)
2022 Waseda Number Theory Symposium, March 23 25, 2022, Waseda, Japan (Online)
Arizona Winter School 2022: Automorphic Forms Beyond GL2, March 5  9, 2022, Tucson, AZ, USA (Online)
Workshop on the work of Dasgupta and Kakde and related topics, February 16  19, 2022, Keio University, Japan (Online)
Annual Number Theory Conference 2022, February 4  5, 2022 (Online)
Algebraic Number Theory and Related Topics 2021, December 13  17, 2021, Kyoto, Japan (Online)
PANT 2021, December 6  10, 2021, Kyoto, Japan (Online)
Lfunctions and Iwasawa theory, November 15  19, 2021, Roscoff, France (Online)
2021 Yonsei Workshop on Elliptic Curves, September 14  15, 2021, Yonsei University, Seoul (Online)
The 9th East Asia Number Theory Conference, August 23  27, 2021, Okinawa, Japan (Online)
Elliptic curves and the special values of Lfunctions, August 2  7, 2021, ICTS, India (Online)
IAS/PCMI Summer School on Number Theory Informed by Computation, July 26  30, 2021 (Online)
IAS/PCMI Summer School on Motivic Homotopy Theory, July 12 16, 2021 (Online)
Annual Number Theory Conference 2021
, February 19  20, 2021, SNU, Seoul (Online)
Automorphic forms, Automorphic representations, Galois representations, and its related topics, January 25  29, 2021, RIMS, Kyoto (Online)
Lvalues and Iwasawa Theory, November 11  12, 2020, NCTS, Taiwan (Online)
2020 KMS Annual Meeting, October 23  24, 2020 (Online)
3rd ChennaiTirupati Number Theory Conference, August 26  August 28, 2020, IIT Madras (Online)
CMC special weeks on number theory, November 12  22, 2019, KIAS (I am an organizer.)
Recent advances in the arithmetic of Galois representations, July 15  19, 2019, Dipartimento di Matematica, Università di Genova, Italy
Iwasawa 2019, June 19  28, 2019, Institut de math\'{e}matiques de Bordeaux
, France
Eisenstein ideal and Iwasawa theory, June 17  22, 2019, Morningside Center of Mathematics, CAS, Beijing, China
Padova school on Serre conjectures and the padic Langlands program, May 27  June 14, 2019, Padova, Italy
KeioYonsei Joint Workshop, December 34, 2018 Keio, Yokohama, Japan
Algebraic Number Theory and Related Topics 2018, November 2630, 2018 RIMS, Kyoto, Japan
2018 Joint Meeting of KMS and DMV, October 36, 2018 COEX, Seoul
Arithmetic Algebraic Geometry
(in honor of the 60th Birthday of
Grzegorz Banaszak), August 2731, 2018, Poznań, Poland
Lectures on FontaineLaffaille theory and ramification of crystalline representations, August 2124, 2018, Korea University
Logarithmic RiemannHilbert correspondences for rigid varieties and applications to Shimura varieties, August 610, 2018, KIAS
Mathematics is a long conversation:
a celebration of Barry Mazur, June 48, 2018, Harvard
Iwasawa Theory and Related Topics, May 1418, 2018, Heidelberg
Arizona Winter School 2018: Iwasawa theory, March 37, 2018, Arizona
Number Theory Festival 2018, February 12  13, 2018, UNIST, Korea
The 7th East Asia Number Theory Conference, February 05  09, 2018, NTU, Taipei, Taiwan
Instructional workshop on class field theory, January 2226, 2018, KIAS (I am an organizer.)
Workshop on padic Lfunctions and algebraic cycles, September 1115, 2017, NTU, Taipei, Taiwan
Special Cycles on Shimura Varieties and Iwasawa Theory
, August 28  September 1, 2017, EPFL, Switzerland
Iwasawa 2017, July 1928, 2017, The University of Tokyo, Tokyo, Japan
Mini Workshop 2017: Arithmetic of Lvalues, July 10–13, 2017, Hotel Everrich, Ganghwado, Korea
Arizona Winter School 2017: Perfectoid spaces, March 1115, 2017, University of Arizona, Tucson, Arizona, USA
The 6th Number Theory Festival, February 20–22, 2017, Sungkyunkwan University, Korea
padic methods for Galois representations and modular forms, February 13–17, 2017, Centre de Recerca Matem`atica, Barcelona, Spain
Algebraic Number Theory and Related Topics 2016, November 28December 2, 2016, RIMS, Kyoto, Japan
Galois Representations and Automorphic Forms, August 1420, 2016, Banach International Center, Będlewo, Poland
The Langlands correspondence in arithmetic and geometry, August 15, 2016, KIAS
New Directions in Iwasawa Theory, June 26 July 1, 2016, Banff, Alberta, Canada
Lfunctions and Arithmetic (A conference celebrating Karl Rubin's 60th birthday), June 1316, 2016, Harvard University, USA
Benjamin Peirce Centennial Conference, June 1012, 2016, Harvard University, USA
The padic Langlands Program and Related Topics, May 1620, 2016, Indiana University, USA
An explicit week: on the recent development of Kato's Euler systems and explicit reciprocity laws, February 2226, 2016, KIAS, Seoul, Korea
The 5th Number theory Festival, February 1416, 2016, Kyungnam University, Korea
POSTECH 2016:
2016 KoreaJapan Joint Seminar, February 14, 2016, Postech, Pohang, Korea
Sendai International Conference on Arithmetic Geometry in 2016, January 2830, 2016, Tohoku University, Katahira campus, Sendai, Japan
Industrious Number Theory 2015, November 2728, 2015, Blue square (the 2nd floor of blue works), Samcheongdong, Seoul
Arithmetic of Euler systems, Aug 2230, 2015, Centro de Ciencias de Benasque Pedro Pascual, Spain
Pan Asian Number Theory 2015, July 20July 24, 2015, Sanya, China
Iwasawa 2015 (Official webpage), July 1317, 2015, King's College, London, UK
Iwasawa 2015 (Practical webpage), July 1317, 2015, King's College, London, UK
padic methods in number theory, May 2630, 2015, Berkeley
Southern California Number Theory Day 2015, May 23, 2015, 2015, UCSD
Southern California Number Theory Day 2015, April 18, 2015, 2015, Caltech
Elliptic Curves, Modular Forms and Iwasawa Theory (in honour of the 70th birthday of John Coates, March 2527, 2015, Cambridge
padic methods in the theory of classical automorphic forms, March 914, 2015, CRM, Montreal
Southern California Number Theory Day, October 18, 2014, UC Irvine, USA
Automorphic Forms and Arithmetic (ICM satelite conference), August 25–28, 2014, Postech, Korea
ICM 2014, August 13–21, 2014, Seoul, Korea
Pan Asian Number Theory 2014 (ICM satelite conference), August 5–9, 2014, Postech, Korea
ALGANT Summer School on Monodromy, June 23–28, 2014, Dobbiaco, Italy
padic Variation in Number Theory (in honor of Glenn Stevens’ 60th Birthday), June 2–6, 2014, BU, USA
Southern California Number Theory Day, March 8, 2014, Caltech, USA
Perfectoid Spaces and their Applications, February 17 – 21, 2014, MSRI, USA
Conference on Stark’s conjectures and related topics (in honor of H. Stark’s retirement), September 20–22, 2013, UCSD, San Diego, USA
Intensive Workshop on Fermat's Last Theorem, August 711, 2013
I gave 8 hour lecture series on Galois deformation.
2013 POSTECH Summer School in Number Theory, July 511, 2013
Arizona Winter School 2013: Modular forms and modular curves, March 913, 2013
The Workshop on Modular Forms and Galois Representations, January 78, 2013
The Sardinian Summer School in Iwasawa Theory, August 612, 2012
Iwasawa 2012, July 23  August 3, 2012
ILJU Postech Summer School 2012: Recent developments in Automorphic forms and Number theory, July 26, 2012
Towards a Local Proof of the Local Langlands Correspondence, May 1213, 2012
Workshop on the padic Langlands program: recent developments and applications, April 2327, 2012
Galois Representations, Shimura Varieties, and Automorphic Forms; A Workshop for Graduate Students and Postdoctoral Fellows, March 1216, 2012
Postech Winter School 2012: The Birch and SwinnertonDyer conjecture, January 614, 2012
KIAS Intensive Lecture Series on Rigid Geometry and the Local Langlands Correspondence, January 25, 2012
Workshop on Iwasawa Theory, October 1516, 2011
The BostonKeio Summer Workshop, September 1519, 2011
Computation with Modular Forms 2011 (Summer School), August 29September 3, 2011
Arizona Winter School 2011: StarkHeegner points, March 12  16, 2011
Postech Winter School 2011: Serre's modularity conjecture, January 14  21, 2011
Sage Days 22: Elliptic Curves (wiki), June 21  July 02, 2010 I worked in Chris Wuthrich's group and I implemented the twist of padic Lfunctions of (ordinary) elliptic curves by the Teichmuller character.
Modular/Geometric Iwasawa Theory and padic Lfunctions, June 14  20, 2010
Sage Days 18: Computations related to the BSD Conjecture, December 1  5, 2009
IAS/PCMI Summer School on Arithmetic of Lfunctions, June 28  July 18, 2009
Workshop on Recent Progressions on R=T, March 17  21, 2008
Asian Conference on Arithmetic Geometry, 2007, September 1518, 2007
