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 A294574 #4 Nov 07 2017 03:29:51
%S A294574 4,8,9,12,13,16,17,18,20,21,22,24,26,27,28,30,31,32,35,39
%N A294574 Numbers having exactly one representation as sum of squares of primes.
%H A294574 <a href="/index/Su#ssq">Index entries for sequences related to sums of squares</a>
%F A294574 A090677(a(n)) = 1.
%t A294574 Flatten[Position[Rest[CoefficientList[Series[Product[1/(1 - x^(Prime[k]^2)), {k, 1, 5}], {x, 0, 40}], x]], 1]]
%Y A294574 Cf. A001248, A078135, A078136, A090677, A134755.
%K A294574 nonn,fini,full
%O A294574 1,1
%A A294574 _Ilya Gutkovskiy_, Nov 02 2017