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 A166386 #3 Mar 30 2012 18:52:34 %S A166386 6,10,72,34,35,41,70,415,1138,824,548,3693,270 %N A166386 The count of primes between the (2*n-1)-th betrothed number and the (2n)-th betrothed number. %Y A166386 Cf. A000040, A005276. %K A166386 nonn %O A166386 1,1 %A A166386 _Juri-Stepan Gerasimov_, Oct 13 2009 %E A166386 a(4) corrected by _R. J. Mathar_, Oct 16 2009