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 A191369 #16 Feb 13 2015 00:26:53 %S A191369 11,155,203,2164,2228,2252,2276,2348,2404,2452,2468,2588,2612,2636, %T A191369 2644,2675,2708,2763,2836,2891,2979,3148,3179,3236,3275,3283,3411, %U A191369 3475,3716,3971,33723,33755,34235,34523,34539,34715,34771,35315,35563,35571,35787,36155,36411,36507,36555,36579 %N A191369 Numbers n with k divisors such that n-1 and n+1 in binary representation have same number k of 0's as 1's. %o A191369 (PARI) isA191369(n)=my(b=vecsort(binary(n-1)),k=#b\2); #b==k+k & !b[k] & b[k+1] & b==vecsort(binary(n+1)) & numdiv(n)==k \\ _Charles R Greathouse IV_, Jun 05 2011 %Y A191369 Cf. A030513, A030516, A030516, A191292. %K A191369 nonn %O A191369 1,1 %A A191369 _Juri-Stepan Gerasimov_, Jun 04 2011 %E A191369 a(10) corrected, a(31)-a(46) added by _Charles R Greathouse IV_, Jun 05 2011