Definition:Happy Number/Sequence

Sequence of Happy Numbers

The sequence of happy numbers begins:

$1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, 103, 109, 129, 130, \ldots$

This sequence is A007770 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008).