Some Useful Websites for Computation:

LMFDB Some Siegel modular forms computation Siegel modular forms of degree 2 and 3 SageMath Mathematica NIST Digital Library of Mathematical Functions OEIS

Some Useful Websites for Conferences:

Number Theory Conferences researchseminars.org Kiran S. Kedlaya's Conference Page in Arithmetic Geometry and Number theory Conferences in Arithmetic Geometry, Algebraic Geometry, and Topology MSRI programs AMS Meetings AWM Programs Women in Number Theory ICERM Programs Sage Days

Some Important Resources for Journals and Research Papers :

arXiv Math Mathscinet