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 A337138 #27 Sep 19 2020 06:13:41 %S A337138 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,17,18,19,20,21,22,23,24,25,26,27, %T A337138 28,29,30,31,33,34,35,37,38,39,40,41,42,43,44,45,46,47,49,50,51,53,54, %U A337138 55,56,57,58,59,60,61,62,63,65,66,67,69,70,71,73,74 %N A337138 Numbers that cannot be written as the sum of 5 or less squares of composite numbers, allowing repetitions (complement of A055075). %C A337138 The largest term of the sequence is a(256) = 1167. %D A337138 R. K. Guy, Unsolved Problems In Number Theory, section C20. %H A337138 Chun Lok Yiu, <a href="/A337138/b337138.txt">Table of n, a(n) for n = 1..256</a> %H A337138 R. G. E. Pinch, L. E. Mattics and Emil Grosswald, <a href="https://www.jstor.org/stable/2324696">Solutions to E3262</a>, Amer. Math. Monthly, 97 (No. 3, 1990), 240-242. %e A337138 52 = 4^2 + 6^2, so 52 is not in the sequence. %Y A337138 Cf. A002808 (composite numbers), A055075 (complement). %K A337138 nonn,fini,full %O A337138 1,2 %A A337138 _Chun Lok Yiu_, Aug 18 2020