A031176 Periods of sum of squares of digits iterated until the sequence becomes periodic.

1, 1, 8, 8, 8, 8, 8, 1, 8, 8, 1, 8, 8, 1, 8, 8, 8, 8, 8, 1, 8, 8, 8, 1, 8, 8, 8, 8, 1, 8, 8, 1, 1, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 8, 8, 8, 8, 1, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 8, 1, 8, 8, 8, 8, 8, 8, 8, 8, 1, 8, 8, 1, 8, 8, 8, 1, 8, 8, 8, 8, 1, 8, 8, 1, 8, 8, 1, 8, 8

Offset: 0

Author

Eric W. Weisstein

Keywords

• nonn
• base

Links

• Eric Weisstein's World of Mathematics, Digit addition.

Crossrefs

Cf. A003132, A099645. [From R. J. Mathar, May 31 2009]

Extensions

The value a(0)=1 was added by R. J. Mathar, May 31 2009