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 A171560 #6 Jan 30 2019 06:19:45 %S A171560 2,9,4,25,36,7,64,729,100,121,1728,2197,2744,3375,256,83521,5832,6859, %T A171560 160000,194481,234256,279841,331776,390625,456976,531441,17210368, %U A171560 20511149,729000000,923521,33554432,35937,1544804416,1838265625 %N A171560 The product of the n-th run of identical consecutive values of A123387. %C A171560 a(n) = n only for 2,4,7? %Y A171560 Cf. A123387. %K A171560 easy,nonn %O A171560 1,1 %A A171560 _Giovanni Teofilatto_, Dec 11 2009 %E A171560 Extended beyond a(25) by _R. J. Mathar_, Jan 30 2010 %E A171560 Name clarified by _Jason Kimberley_, Jul 02 2018