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 A067494 #10 Jun 10 2023 11:44:43 %S A067494 1,16777216,134217728,1073741824,18014398509481984,144115188075855872, %T A067494 1152921504606846976,19342813113834066795298816, %U A067494 154742504910672534362390528,1237940039285380274899124224 %N A067494 Powers of 8 with initial digit 1. %H A067494 Muniru A Asiru, <a href="/A067494/b067494.txt">Table of n, a(n) for n = 1..330</a> %t A067494 Select[8^Range[0,30],IntegerDigits[#][[1]]==1&] (* _Harvey P. Dale_, Jun 10 2023 *) %o A067494 (GAP) Filtered(List([0..40],n->8^n),i->ListOfDigits(i)[1]=1); # _Muniru A Asiru_, Oct 22 2018 %Y A067494 Cf. A067480, A067481, A067482, A067483, A067484, A067485, A067486, A067487, A067488, A067489, A067490, A067491, A067492, A067493. %K A067494 base,easy,nonn %O A067494 1,2 %A A067494 _Amarnath Murthy_, Feb 09 2002 %E A067494 Offset 1 by _Michel Marcus_, Oct 19 2018