Positions of odd numbers in A004431 (sums of 2 distinct nonzero squares).

Terms

a(0) =1a(1) =3a(2) =4a(3) =6a(4) =8a(5) =10a(6) =12a(7) =13a(8) =16a(9) =18a(10) =19a(11) =21a(12) =25a(13) =26a(14) =28a(15) =30a(16) =33a(17) =34a(18) =36a(19) =38a(20) =41a(21) =42a(22) =45a(23) =46a(24) =47a(25) =50a(26) =52a(27) =55a(28) =56a(29) =57