%I #14 Apr 15 2020 05:10:35
%S 1,1,12,22,4,10,22,28,10,22,1,12,22,28,12,22,6,10,22,28,12,22,28,12,
%T 22,28,10,22,28,12,22,28,12,22,28,10,22,4,12,22,4,12,22,28,10,22,28,
%U 10,22,28,10,22,28,10,22,4,12,22,28,12,22,6,10,22,28,12,22,28,10,22
%N Periods of sum of 5th 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 14 2020