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 A032709 #11 Aug 13 2024 11:14:57 %S A032709 1,4,7,9,15,16,18,22,24,28,31,34,37,39,42,43,46,49,51,52,55,60,63,66, %T A032709 72,78,79,81,85,87,90,93,94,108,112,114,115,129,133,138,141,154,157, %U A032709 159,162,163,169,171,177,178,180,181,184,192,195,196,204,205,211,222 %N A032709 Numbers k such that k prefixed by '9' and followed by '1' is prime. %Y A032709 Cf. A032702-A032733. %K A032709 nonn,base %O A032709 1,2 %A A032709 _Patrick De Geest_, May 15 1998 %E A032709 Offset changed by _Andrew Howroyd_, Aug 13 2024