Sum over divisors d of n of Kronecker symbol (5|d).

Terms

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