61
This number is a prime.
Just showing those entries submitted by 'Mirizzi': (Click here to show all)
61 is the (6 - 1)th repfigit number: 61, 6 + 1 = 7, 1 + 7 = 8, 7 + 8 = 15, 8 + 15 = 23, 15 + 23 = 38, 23 + 38 = 61. [Mirizzi]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell