89

This number is a prime.

Single Curio View:   (Seek other curios for this number)
Hugo Steinhaus (1887-1972) proved that if you take any positive integer, find the sum of the squares of its digits, and then repeat; that you will either come to 1 or the cyclic sequence 145, 42, 20, 4, 16, 37, 58, 89.

Submitted: 2003-01-27 01:01:25;   Last Modified: 2009-01-17 15:55:33.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell