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 A316867 #13 Aug 11 2018 14:08:59 %S A316867 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0, %T A316867 0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,1,1,1,1,1,1,2,1, %U A316867 1,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0 %N A316867 Number of times 6 appears in decimal expansion of n. %e A316867 a(0) = 0 since the decimal representation of 0 does not contain the digit 6. %e A316867 a(6) = 1 since 6 appears once in the decimal expansion of 6. %t A316867 Array[ DigitCount[#, 10, 6] &, 105, 0] %o A316867 (PARI) a(n) = #select(x->x==6, digits(n)); \\ _Michel Marcus_, Jul 20 2018 %Y A316867 Cf. A043513, A043514, A043515, A043516. %Y A316867 Cf. A055641, A268643, A316863, A316864, A316865, A316866, A316868, A316869, A102683. %K A316867 base,easy,nonn %O A316867 0,67 %A A316867 _Robert G. Wilson v_, Jul 15 2018