a(n) = min(x : x^2 + n^2 = 0 mod (x+n-1)).

Terms

a(0) =1a(1) =4a(2) =11a(3) =2a(4) =37a(5) =56a(6) =11a(7) =106a(8) =21a(9) =172a(10) =3a(11) =42a(12) =301a(13) =60a(14) =407a(15) =22a(16) =93a(17) =596a(18) =119a(19) =742a(20) =9a(21) =4a(22) =991a(23) =42a(24) =1177a(25) =1276a(26) =255a(27) =62a(28) =37a(29) =1712