- Perfect Numbers: Perfect Number, Mersenne Prime, 6, 28, List of Perfect Numbers, 496
- Integer Sequences: Prime Number, Factorial, Binomial Coefficient, Perfect Number, Carmichael Number, Integer Sequence, Mersenne Prime
- Geometric and Analytic Number Theory (Universitext) by Edmund Hlawka, Johannes Schoißengeier, et all 1991-08-23
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