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 A276137 #15 Sep 08 2022 08:46:17 %S A276137 0,1,3,5,7,9,10,11,13,15,17,19,30,31,33,35,37,39,50,51,53,55,57,59,70, %T A276137 71,73,75,77,79,90,91,93,95,97,99,100,101,103,105,107,109,110,111,113, %U A276137 115,117,119,130,131,133,135,137,139,150,151,153,155,157 %N A276137 Numbers without the decimal digits 2, 4, 6 and 8. %t A276137 Select[Select[Select[Select[Range[0, 400], FreeQ[IntegerDigits@#, 2] &], FreeQ[IntegerDigits@#, 4] &], FreeQ[IntegerDigits@#, 6] &], FreeQ[IntegerDigits@#, 8] &] %o A276137 (Magma) [n: n in [0..500] | IsEmpty(Set([2..8 by 2]) meet Set(Intseq(n)))]; %o A276137 (PARI) my(table=[0,1,3,5,7,9]); a(n) = fromdigits(apply(d->table[d+1],digits(n-1,6))); \\ _Kevin Ryde_, Jun 26 2021 %Y A276137 Cf. A096844 (with at least one 0 digit). %Y A276137 Subsequence of A168501. %K A276137 nonn,base,easy %O A276137 1,3 %A A276137 _Vincenzo Librandi_, Aug 22 2016