Difference between sums of quadratic residues and non-residues modulo n (residues are not necessarily coprime to n).
A255644
Difference between sums of quadratic residues and non-residues modulo n (residues are not necessarily coprime to n).
Terms
- a(0) =0a(1) =1a(2) =-1a(3) =-4a(4) =0a(5) =1a(6) =-7a(7) =-18a(8) =-12a(9) =5a(10) =-11a(11) =-38a(12) =0a(13) =-7a(14) =-45a(15) =-92a(16) =0a(17) =-33a(18) =-19a(19) =-120a(20) =-70a(21) =-11a(22) =-69a(23) =-192a(24) =-50a(25) =13a(26) =-99a(27) =-210a(28) =0a(29) =-135
External references
- oeis: A255644