Middle term of a triple of consecutive numbers which are sums of two squares.

Terms

a(0) =1a(1) =9a(2) =73a(3) =289a(4) =801a(5) =1801a(6) =3529a(7) =6273a(8) =10369a(9) =16201a(10) =24201a(11) =34849a(12) =48673a(13) =66249a(14) =88201a(15) =115201a(16) =147969a(17) =187273a(18) =233929a(19) =288801a(20) =352801a(21) =426889a(22) =512073a(23) =609409a(24) =720001a(25) =845001a(26) =985609a(27) =1143073a(28) =1318689a(29) =1513801