31

This number is a prime.

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The earliest and the only known case such that the sum of the divisors of two distinct numbers (16 and 25) is the same prime quantity (31), that is to say: 1+2+4+8+16 = 31; 1+5+25 = 31. [Rivera]

Submitted: 2003-05-21 20:41:13; Last Modified: 2008-07-17 13:23:44.