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 A096515 #4 Oct 15 2013 22:32:26
%S A096515 3,4,5,6,7,9,11,14,16,21,23,25,26,30,31,33,45,62,63,64,66,68,69,76,78,
%T A096515 84,102,104,105,106,108,123,124,125,127,128,129,130,132,163,167,168,
%U A096515 169,173,175,193,194,195,196,197,227,228,229,233,235,237,238,239,245,257
%N A096515 Solutions to A096509[x]=4; number of prime-powers [including primes] in the neighborhood of x with Ceiling[Log[x]] radius equals 4.
%e A096515 n=63: in [58,68], {59,61,64,67} are the 4 corresponding prime powers.
%K A096515 nonn
%O A096515 1,1
%A A096515 _Labos Elemer_, Jul 12 2004