This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A069647 #9 Jul 31 2017 02:42:10 %S A069647 1,4,8,14641,229345007,9474296896,886899938586555644327, %T A069647 1968149944695589999318735995870695144816896, %U A069647 29733387998758905886191953999849859976998299361889769463896694547608377966796875 %N A069647 a(1) = 1; for n > 1, the smallest n-th power with the digit sum also a nontrivial n-th power, i.e., 10^n is not a member. %C A069647 Are there members with digit sum other than 2^n? %e A069647 a(4) = 14641 because 14641 is 11^4 and its digit sum is 16, which is 2^4. %Y A069647 Cf. A069648. %K A069647 hard,nonn,base %O A069647 1,2 %A A069647 _Amarnath Murthy_, Apr 04 2002 %E A069647 Corrected and extended by _David Wasserman_, Apr 23 2003