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 A245420 #9 Jul 22 2014 22:18:42 %S A245420 8,8,16,24,40,64,96,160,256,408,648,1040,1664,2664,4264,6816,10912, %T A245420 17456,27928,44688,71496,114400,183040,292864,468576,749728,1199560, %U A245420 1919296,3070872,4913400,7861440,12578304,20125288,32200456,51520728,82433168,131893072 %N A245420 Number of nonnegative integers with property that their base 8/5 expansion (see A024647) has n digits. %e A245420 a(2) = 8 because 50, 51, 52, 53, 54, 55, 56, and 57 are the base 8/5 expansions for the numbers 8-15 respectively and these are the only integers with 2 digits. %o A245420 (Sage) %o A245420 A=[1] %o A245420 for i in [1..100]: %o A245420 A.append(ceil(((8-5)/5)*sum(A))) %o A245420 [8*x for x in A] %Y A245420 Cf. A024647, A245356, A081848. %K A245420 nonn,base %O A245420 1,1 %A A245420 _Tom Edgar_, Jul 21 2014