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The Positive Integers
Information about the positive integers, with counts of some number-theoretic functions, maintained by Saqib Kadri.
http://www.positiveintegers.org/
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Pseudoprimes and Carmichael Numbers
Tables of the Fermat pseudoprimes base 2 up to 10^13 and Carmichael numbers up to 10^17 compiled by Richard Pinch.
http://www.chalcedon.demon.co.uk/rgep/carpsp.html
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Table of Masses of 32-dimensional Even Unimodular Lattices
With any given root system. Oliver King.
http://www.csua.berkeley.edu/~ok/rootmass.txt.gz
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Practical Numbers
A number is practical if all smaller numbers are sums of distinct divisors. Tables compiled by Giuseppe Melfi.
http://www.dm.unipi.it/gauss-pages/melfi/public_html/pratica.html
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A Database for Number Fields
By Jürgen Klüners and Gunter Malle. Polynomials for all transitive groups up to degree 15, for most of the possible combinations of signature and Galois group. Up to degree 7 the fields with minimal (absolute) discriminant with given Galois group and si
http://www.math.uni-duesseldorf.de/~klueners/minimum/
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