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 A131497 #14 Nov 26 2019 04:40:06 %S A131497 1,4,15,56,213,813,3104,9632089,36787239,140499215,2049402728, %T A131497 7827156489,29893772401,6360445726168,24292055125871,354337952833519, %U A131497 5168578128432327,19740029272114749,4200051540382303047,16040995858310522148,233983234616956426935,893637628328498285466,3413014663516027432461 %N A131497 Values of k such that k^e starts with the digits of k. %C A131497 Subsequence of ceiling(10^(k/(e-1))). - _Max Alekseyev_, Sep 08 2013 %H A131497 Max Alekseyev, <a href="/A131497/b131497.txt">Table of n, a(n) for n = 1..400</a> %e A131497 213 is a term of this sequence because 213^e = 2133987.96483717..., which starts with 213. %o A131497 (PARI) e=exp(1);s=1;for(i=1,50000,s=i^e; while(s-i>11,s=s/10); if(floor(s)==i,printp1(i,", "),)) %Y A131497 Cf. A131494, A131496. %K A131497 nonn,base %O A131497 1,2 %A A131497 _Randy L. Ekl_, Aug 12 2007 %E A131497 3 more terms from _Ryan Propper_, Dec 30 2007 %E A131497 a(11)-a(14) from _Donovan Johnson_, Oct 29 2010 %E A131497 Terms a(15) onward from _Max Alekseyev_, Sep 08 2013