56
This number is a composite.
Single Curio View: (Seek other curios for this number)
56 = sigma(sigma(sigma(5+6))). 56 is the smallest multidigit number
with this property and there is only one other. [Firoozbakht]
Submitted: 2004-09-03 15:39:26; Last Modified: 2009-05-09 01:59:20.
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