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 A191322 #13 Oct 20 2024 04:08:39 %S A191322 0,0,0,1,1,1,1,0,1,0,1,1,0,0,0,1,0,0,0,0,1,2,1,1,2,2,1,1,2,0,0,1,2,2, %T A191322 2,3,2,2,2,0,0,1,2,3,3,2,2,2,3,0,1,2,2,3,4,2,3,3,3,0,1,2,3,2,2,4,4,4, %U A191322 4,0,0,1,2,2,1,4,4,4,4,0,0,1 %N A191322 Number of bases in which both n and the reversal of n are 3-digit numbers. %F A191322 a(n) = a(inv(n)). %F A191322 a(A002113(n)) = A191291(A002113(n)). %F A191322 a(n) <= min(A191291(n),A191291(inv(n))). %e A191322 a(36)=3 since 36 is 3-digit number in bases 4,5,6 and 63 is 3-digit number in bases 4,5,6,7 such that we have 3 common bases. %Y A191322 Cf. A002113, A191291. %K A191322 nonn,base %O A191322 1,22 %A A191322 _Vladimir Shevelev_, May 30 2011