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 A274463 #20 Jun 27 2016 03:57:42 %S A274463 5,25,625,12890625,6259918212890625,4106619977392256259918212890625, %T A274463 80863811000557423423230896109004106619977392256259918212890625 %N A274463 Subsequence of the automorphic numbers (A003226) with initial term 5 and such that a(n+1) ends with the digits of a(n). %C A274463 An automorphic number is a number whose square ends in the same digits as the number itself. %C A274463 The next term has 126 digits. %H A274463 Colin Barker, <a href="/A274463/b274463.txt">Table of n, a(n) for n = 1..10</a> %H A274463 Wikipedia, <a href="http://en.wikipedia.org/wiki/Automorphic_number">Automorphic number</a> %o A274463 (PARI) %o A274463 seq(m, maxn) = L=List(); for(j=1, maxn, listput(L, m); m=(3*m^2-2*m^3)%10 ^ (2*sizedigit(m))); Vec(L) %o A274463 seq(5, 8) %Y A274463 Cf. A003226, A274464. %K A274463 nonn,base %O A274463 1,1 %A A274463 _Colin Barker_, Jun 24 2016