31
This number is a prime.
Single Curio View: (Seek other curios for this number)
31 = (25-1)/(2-1) = (53-1)/(5-1) = (63+1)/(6+1). [Ordowski]
Submitted: 2013-04-27 14:59:03; Last Modified: 2013-04-27 22:31:27.
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