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 A131614 #13 Jun 08 2025 01:13:29
%S A131614 0,1,2,3,5,6,8,10,11,12,13,16,17,19,21,33,36,51,55,56,100
%N A131614 Numbers k such that the decimal expansion of 3^k contains no 8.
%C A131614 I conjecture that 100 is the last term.
%t A131614 Join[{0}, Select[ Range@10000, FreeQ[ IntegerDigits[3^# ], 8] &]]
%o A131614 (Magma) [n: n in [0..1000] | not 8 in Intseq(3^n) ]; // _Vincenzo Librandi_, May 06 2015
%Y A131614 Cf. similar sequences listed in A131613.
%Y A131614 Cf. A007377.
%K A131614 base,fini,nonn
%O A131614 1,3
%A A131614 _Shyam Sunder Gupta_, Sep 01 2007
%E A131614 Adapted Mma and initial 0 added by _Vincenzo Librandi_, May 06 2015