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 A217736 #18 Mar 13 2018 11:58:31 %S A217736 16,52,133,233,429,654,1095,1579,2204,2880,3969,5125,6350,7794,9315, %T A217736 11431,13832,16433,19458,22707,26071,29915,34140,38901,44377,50306, %U A217736 57030,64255,71651,79220,87501,96150,104986,114011,125247,137568,150793,164717,178878 %N A217736 Sum of first n squares of semiprimes. %C A217736 There are 68 such numbers less than one million; a(68) = 988849. %H A217736 Christian N. K. Anderson, <a href="/A217736/b217736.txt">Table of n, a(n) for n = 1..10000</a> %e A217736 a(3) = 4^2 + 6^2 + 9^2 = 133. %t A217736 Accumulate[Select[Range[200],PrimeOmega[#]==2&]^2] (* _Harvey P. Dale_, Mar 13 2018 *) %Y A217736 Cf. A062198. Equals sum(A001358^2), and sum(A074985). %K A217736 nonn %O A217736 1,1 %A A217736 _Kevin L. Schwartz_ and _Christian N. K. Anderson_, Mar 22 2013