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 A067491 #9 Oct 21 2018 17:06:36 %S A067491 1,125,15625,1953125,1220703125,152587890625,19073486328125, %T A067491 11920928955078125,1490116119384765625,186264514923095703125, %U A067491 116415321826934814453125,14551915228366851806640625,1818989403545856475830078125,1136868377216160297393798828125 %N A067491 Powers of 5 with initial digit 1. %H A067491 Muniru A Asiru, <a href="/A067491/b067491.txt">Table of n, a(n) for n = 1..300</a> %p A067491 select(x-> "1"=""||x[1], [5^n$n=0..50])[]; # _Alois P. Heinz_, Oct 21 2018 %o A067491 (GAP) Filtered(List([0..40],n->5^n),i->ListOfDigits(i)[1]=1); # _Muniru A Asiru_, Oct 21 2018 %Y A067491 Cf. A067480, A067481, A067482, A067483, A067484, A067485, A067486, A067487, A067488, A067489, A067490. %K A067491 base,easy,nonn %O A067491 1,2 %A A067491 _Amarnath Murthy_, Feb 09 2002 %E A067491 Offset 1 from _Michel Marcus_, Oct 19 2018