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 A062931 #14 Mar 13 2023 12:44:20
%S A062931 0,1,2,3,4,28,30,58,60,88,90,118,120,168,179,180,348,359,360,840,895,
%T A062931 900,1740,1795,1800,5370,5400,11726,11984,16200,21142,26850,27000,
%U A062931 38340,57574,137128,183960,214207,293628,421560,750288,866700,1043027,1304280,1468140
%N A062931 Numbers k that, when expressed in base 5 and then interpreted in base 9, give a multiple of k.
%e A062931 28 in base 5 is 103, which interpreted in base 9 is 84 = 3*28.
%t A062931 Join[{0},Select[Range[11*10^5],Divisible[FromDigits[ IntegerDigits[ #,5],9],#]&]] (* _Harvey P. Dale_, Apr 27 2015 *)
%Y A062931 Cf. A062845, A062846, A062847, A062848, A062849, A062850, A062853, A062864, A062865, A062884, A062889, A062891, A062920, A062921, A062922, A062923, A062925, A062928, A062929, A062930, A062934, A062937, A062939, A062942, A062943, A062944.
%K A062931 base,nonn
%O A062931 1,3
%A A062931 _Erich Friedman_, Jul 21 2001
%E A062931 More terms from _Naohiro Nomoto_, Aug 06 2001
%E A062931 Offset changed to 1 by _Georg Fischer_, Mar 13 2023