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Periods of sum of 10th powers of digits iterated until the sequence becomes periodic.
1

%I #12 Apr 16 2020 01:23:04

%S 1,1,17,123,17,17,123,123,123,123,1,17,123,17,123,123,123,81,81,123,

%T 17,123,123,123,123,123,123,123,123,123,123,17,123,123,123,123,123,81,

%U 17,123,17,123,123,123,123,123,7,123,123,123,17,123,123,123,123

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

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Digitaddition.html">Digitaddition</a>

%K nonn,base

%O 0,3

%A _Eric W. Weisstein_

%E Missing a(0)=1 inserted by _Sean A. Irvine_, Apr 15 2020