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 A281827 #15 Feb 02 2017 08:58:30 %S A281827 0,4,34,58,102,114,186,282,246,210,354,390,330,426,462,666,906,774, %T A281827 750,690,630,870,1026,990,1122,1134,1110,1050,1170,1554,1914,1290, %U A281827 1530,1650,1470,1770,1830,2142,1710,2070,2874,1950,2250,1890,2838,2370,2550,2490,2430,3354,2670,3726 %N A281827 Least number k such that k is the sum of two primes in exactly n ways, where both primes are of the form x^2 + y^2, or -1 if no such k exists. %e A281827 a(2) = 34 because 34 = 5 + 29 = 17 + 17; 5, 17, 29 are primes of the form x^2 + y^2 and 34 is the least number with this property. %Y A281827 Cf. A001172, A002313. %K A281827 nonn %O A281827 0,2 %A A281827 _Altug Alkan_, Jan 31 2017