Sum of squares of primes = 1 mod 4 dividing n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =25a(5) =0a(6) =0a(7) =0a(8) =0a(9) =25a(10) =0a(11) =0a(12) =169a(13) =0a(14) =25a(15) =0a(16) =289a(17) =0a(18) =0a(19) =25a(20) =0a(21) =0a(22) =0a(23) =0a(24) =25a(25) =169a(26) =0a(27) =0a(28) =841a(29) =25