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%I #6 Dec 31 2023 16:35:11
%S 1,4,5,6,3,9,18,27,27,1,18,27,18,9,45,27,54,54,63,15,45,72,81,72,72,
%T 81,126,72,72,27,63,81,90,81,117,99,135,135,117,54,171,144,135,144,
%U 126,171,225,126,180,72,207,162,126,162,180,198,207,234,234,135,225,207,225,270
%N Sum of digits(product of nonzero digits(n^n)).
%C Conjecture: a(n) = a(n+1) for infinitely many positive integers. Largest found is n=2577, i.e. sd(pnd(2577^2577)) = sd(pnd(2578^2578)) = 18315.
%Y Cf. A051801, A007953.
%K base,easy,nonn
%O 1,2
%A _Jason Earls_, Jun 24 2004