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%I #13 Apr 16 2020 01:22:14
%S 1,1,25,154,154,154,154,25,154,154,1,25,154,154,1,25,25,1,154,154,25,
%T 154,154,25,154,154,154,25,154,1,154,154,25,154,25,25,25,1,154,154,
%U 154,1,154,25,154,25,25,154,154,154,154,25,154,25,25,25,154,25,154
%N Periods of sum of 8th 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
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