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 A032549 #22 Oct 25 2019 09:43:52 %S A032549 1,2,3,4,5,6,51,102,105,153,156,207,210,258,261,312,315,2589,2590, %T A032549 2601,2753,5354,5355,5506,8108,8259,8260,10861,11013,11025,13614, %U A032549 13615,13626,13766,13778,16379,16380,16531,33045,140403,289065,1123224 %N A032549 Numbers that, when expressed in base 7 and then interpreted in base 10, yield a multiple of the original number. %C A032549 Decimal 'base-7 looking' numbers divided by their actual base-7 values (n) is an integer. %H A032549 Giovanni Resta, <a href="/A032549/b032549.txt">Table of n, a(n) for n = 1..70</a> (terms < 10^12, first 63 terms from Paolo P. Lava) %t A032549 Select[Range@ 300000, Mod[ FromDigits[ IntegerDigits[#, 7]], #] == 0 &] (* _Giovanni Resta_, Oct 21 2019 *) %Y A032549 Cf. A032548, A032550. See also A032532 for explanation. %K A032549 nonn,base %O A032549 1,2 %A A032549 _Patrick De Geest_, Apr 15 1998 %E A032549 Offset set to 1 by _Giovanni Resta_, Oct 21 2019 %E A032549 Name edited by _Jon E. Schoenfield_, Oct 25 2019