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 A178843 #4 Aug 10 2015 00:39:18 %S A178843 1,2,3,4,5,6,7,8,9,11,12,14,16,18,21,22,24,26,28,31,32,34,36,38,41,42, %T A178843 44,46,48,51,52,54,56,58,61,62,64,66,68,71,72,74,76,78,81,82,84,86,88, %U A178843 91,92,94,96,98,111,113,116,119,121,123,126,129,141,143,146,149,161,163 %N A178843 Numbers in which the n-th digit is either a divisor or a nonzero multiple of n. %e A178843 321 is in the sequence because (counting digits from the left) 3 is a multiple of 1, 2 is a multiple of 2, and 1 is a divisor of 3. %Y A178843 Cf. A069570. %K A178843 base,easy,nonn %O A178843 1,2 %A A178843 _Jeremy Gardiner_, Jun 17 2010