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 A248712 #7 Dec 09 2019 12:07:05 %S A248712 2210,3770,4810,4930,5330,6290,6890,6970,7930,9010,9490,10370,10730, %T A248712 11570,11890,12410,12610,12818,13130,14170,14690,15130,15170,15370, %U A248712 16354,16490,17170,17690,17810,18122,18530,19210,19370,19610,20410,21170,21730,22490 %N A248712 Numbers n that are the product of four distinct primes such that x^2+y^2 = n has integer solutions. %C A248712 Union of 2*A264498 and A264499. - _Ray Chandler_, Dec 09 2019 %H A248712 Ray Chandler, <a href="/A248712/b248712.txt">Table of n, a(n) for n = 1..10000</a> %e A248712 2210 is in the sequence because 2210 = 2*5*13*17, and x^2+y^2=2210 has integer solutions (x,y) = (1,47), (19,43), (23,41) and (29,37). %e A248712 32045 is in the sequence because x^2 + y^2 = 32045 = 5*13*17*29 has solutions (x,y) = (2,179), (19,178), (46,173), (67,166), (74,163), (86,157), (109,142) and (122,131). %Y A248712 Cf. A248649, A264498, A264499. %K A248712 nonn %O A248712 1,1 %A A248712 _Colin Barker_, Oct 12 2014