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 A097409 #9 Feb 16 2025 08:32:54
%S A097409 1,3,2,1,3,7,1,3,5,1,1,2,3,5,7,1,1,1,2,3,4,5,6,7,9,1,1,1,2,2,2,3,3,4,
%T A097409 5,6,6,7,9,1,1,1,1,1,1,2,2,2,2,3,3,3,4,4,5,5,6,6,7,7,8,9,9,1,1,1,1,1,
%U A097409 1,1,1,1,2,2,2,2,2,2,3,3,3,3,3,4,4,4,4,5,5,5,6,6,6,7,7,8,8,9,9,1,1,1,1,1,1
%N A097409 Initial decimal digit of n^5.
%H A097409 Alois P. Heinz, <a href="/A097409/b097409.txt">Table of n, a(n) for n = 1..10000</a>
%H A097409 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GelfandsQuestion.html">Gelfand's Question</a>
%e A097409 1, 32, 243, 1024, 3125, 7776, 16807, 32768, 59049, 100000, ...
%p A097409 a:= n-> parse(""||(n^5)[1]):
%p A097409 seq(a(n), n=1..120); # _Alois P. Heinz_, Jan 28 2016
%Y A097409 Cf. A000027, A002993, A002994, A097408, A097410, A097411, A097412, A097413, A097414.
%K A097409 nonn,base,easy
%O A097409 1,2
%A A097409 _Eric W. Weisstein_, Aug 16 2004