Position of 1 + n^2 in A004431 (sums of 2 distinct nonzero squares).

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =10a(5) =14a(6) =19a(7) =24a(8) =30a(9) =37a(10) =42a(11) =51a(12) =59a(13) =68a(14) =77a(15) =87a(16) =98a(17) =109a(18) =121a(19) =132a(20) =146a(21) =157a(22) =170a(23) =186a(24) =202a(25) =216a(26) =231a(27) =249a(28) =265a(29) =282