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- Mersenne Prime Digits and Names - Landon Curt Noll
Tables of known Mersenne prime numbers: discovery dates, digit counts, decimal digits (American and European styles), English names, and English names with numbers.
- Perfect Numbers - MacTutor Math History Archives
Linked essay describing the work on perfect numbers from Pythagoras through Euclid, Nicomachus, the Arabs, Cataldi, Descartes, Mersenne, Fermat, Euler, Barlow, Catalan, Cole, and others; with other web sites and 20 references (books/articles).
- Prime Curios! - G. L. Honaker, Jr., Chris K. Caldwell
A collection of curiosities, wonders and trivia related to prime numbers. Look up a number (up to 10^21+) and find what connections it has to the primes. The database has over 3400 curios corresponding to more than 1960 different numbers. The number of entries increases as members of the mathematical community submit more information.