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 A057701 #6 Nov 18 2019 03:21:59 %S A057701 1,3,7,9,13,15,31,33,49,51,67,69,73,75,127,129,133,135,169,171,193, %T A057701 195,235,237,259,261,283,285,319,321,391,393,427,429,475,477,487,489, %U A057701 517,519,535,537,577,579,613,615,619,621,643,645,727,729,739,741,883,885 %N A057701 Twin lucky numbers: (n,m) are lucky numbers with |n-m|=2. %H A057701 Amiram Eldar, <a href="/A057701/b057701.txt">Table of n, a(n) for n = 1..10000</a> %Y A057701 Cf. A000959. %K A057701 easy,nonn %O A057701 1,2 %A A057701 _Naohiro Nomoto_, Oct 23 2000 %E A057701 Offset corrected by _Amiram Eldar_, Nov 18 2019