A031213 Periods of sum of 10th powers of digits iterated until the sequence becomes periodic.

1, 1, 17, 123, 17, 17, 123, 123, 123, 123, 1, 17, 123, 17, 123, 123, 123, 81, 81, 123, 17, 123, 123, 123, 123, 123, 123, 123, 123, 123, 123, 17, 123, 123, 123, 123, 123, 81, 17, 123, 17, 123, 123, 123, 123, 123, 7, 123, 123, 123, 17, 123, 123, 123, 123

Offset: 0

Author

Eric W. Weisstein

Keywords

• nonn
• base

Links

• Eric Weisstein's World of Mathematics, Digitaddition

Extensions

Missing a(0)=1 inserted by Sean A. Irvine, Apr 15 2020