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 A350630 #8 Feb 05 2022 23:35:01 %S A350630 1,2,9,12,18,21,24,27,30,33,36,39,45,48,51,54,57,60,63,66,69,72,75,78, %T A350630 81,84,87,90,93,96,99,102,105,108,111,114,117,120,126,129,132,135,138, %U A350630 141,144,147,150,153,156,159,162,164,165,168,171,174,177,180,183,186,189,192 %N A350630 Positive numbers k such that 2k cannot be written as 3^i (i >= 1) plus a prime. %C A350630 A350629 divided by 2. %Y A350630 Cf. A006285, A058517, A350628, A350629, A350957, A350958. %K A350630 nonn %O A350630 1,2 %A A350630 _N. J. A. Sloane_, Feb 05 2022