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 A060976 #21 Jan 28 2017 19:33:34
%S A060976 1,25,35,49,65,77,85,91,95,115,119,121,125,133,143,145,155,161,169,
%T A060976 175,185,187,203,205,209,215,217,221,235,245,247,259,265,287,289,295,
%U A060976 299,301,305,319,323,325,329,335,341,343,355,361,365,371,377,391,395,403
%N A060976 Odd nonprimes c which divide Bernoulli(2*c).
%C A060976 a(n) == +- 1 (mod 6).
%C A060976 First differences: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24. - _Robert G. Wilson v_, Jan 26 2017
%H A060976 Robert G. Wilson v, <a href="/A060976/b060976.txt">Table of n, a(n) for n = 1..5373</a>
%t A060976 Do[ If[ Mod[ Numerator[ BernoulliB[ 2*n ] ], 2n ] == 0 && ! PrimeQ[ n ], Print[ n ] ], {n, 1, 250, 2} ]
%o A060976 (PARI) select(n->n%2&!isprime(n)&numerator(bernfrac(2*n))%n==0,vector(1000,i,i)) \\ _Charles R Greathouse IV_, May 26 2011
%K A060976 nonn
%O A060976 1,2
%A A060976 _Robert G. Wilson v_, May 09 2001