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 A031159 #8 Nov 15 2019 06:27:10 %S A031159 3,9,15,33,51,69,75,129,135,171,195,237,261,285,321,393,429,477,489, %T A031159 519,537,579,615,621,645,729,741,885,897,927,933,981,993,1011,1023, %U A031159 1041,1095,1107,1203,1233,1251,1263,1389,1419,1473,1497,1503 %N A031159 Twin lucky numbers (upper terms). %H A031159 Amiram Eldar, <a href="/A031159/b031159.txt">Table of n, a(n) for n = 1..10000</a> %Y A031159 Cf. A000959, A031158, A031159, A031160. %K A031159 nonn %O A031159 1,1 %A A031159 _Patrick De Geest_ %E A031159 Offset corrected by _Amiram Eldar_, Nov 15 2019