7

This number is a prime.

Single Curio View:   (Seek other curios for this number)
The first prime happy number. Replace a number by the sum of the squares of its digits, and repeat the process until the number equals 1, or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are called happy numbers. There are exactly 7 prime happy numbers less than 100. Can you find all 7?

Submitted: 1999-09-02 18:40:00;   Last Modified: 2009-03-29 12:48:48.
Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell