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 A037942 #18 Feb 16 2025 08:32:37 %S A037942 1,2,5,10,13,17,25,26,29,34,37,41,50,53,58,61,65,65,73,74,82,85,85,89, %T A037942 97,101,106,109,113,122,125,130,130,137,145,145,146,149,157,169,170, %U A037942 170,173,178,181,185,185,193,194 %N A037942 Numbers of the form x^2 + y^2 with x >= 0, y >= 0, gcd(x,y)=1, with multiplicity. %H A037942 N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references). %H A037942 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PostageStampProblem.html">Postage Stamp Problem</a>. %o A037942 (PARI) s=14; v=[]; for(y=0,s,for(x=0,y,if(gcd(x,y)==1,r=x*x+y*y; if(r<=s*s,v=concat(v,r))))); vecsort(v) \\ Craig Clapp (craig_clapp(AT)earthlink.net), Apr 30 2010 %Y A037942 If repetitions are deleted, same as A008784. %Y A037942 Cf. A224770 (multiplicity 2), A281877 (multiplicity >= 3). %K A037942 nonn %O A037942 1,2 %A A037942 Nissim Broudo (broudo(AT)brain.math.fau.edu) %E A037942 Missing second instance of 85 (6^2+7^2 = 2^2+9^2 = 85) added by Craig Clapp (craig_clapp(AT)earthlink.net), Apr 30 2010