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 A245418 #10 Jul 22 2014 12:35:21 %S A245418 5,5,10,15,25,40,70,115,190,320,530,885,1475,2460,4100,6830,11385, %T A245418 18975,31625,52710,87850,146415,244025,406710,677850,1129750,1882915, %U A245418 3138190,5230320,8717200,14528665,24214440,40357400,67262335,112103890,186839820,311399700 %N A245418 Number of nonnegative integers with property that their base 5/3 expansion (see A024633) has n digits. %e A245418 a(2) = 5 because 30, 31, 32, 33 and 34 are the base 5/3 expansions for the integers 5, 6, 7, 8 and 9 respectively and these are the only integers with 2 digits. %o A245418 (Sage) %o A245418 A=[1] %o A245418 for i in [1..60]: %o A245418 A.append(ceil(((5-3)/3)*sum(A))) %o A245418 [5*x for x in A] %Y A245418 Cf. A024633, A245356, A081848. %K A245418 nonn,base %O A245418 1,1 %A A245418 _Hailey R. Olafson_, Jul 21 2014