a(n) is the number of distinct solution sets to the quadratic equations u*x^2 + v*x + w = 0 with integer coefficients u, v, w, abs(u) + abs(v) + abs(w) <= n having a negative discriminant.
A381710
a(n) is the number of distinct solution sets to the quadratic equations u*x^2 + v*x + w = 0 with integer coefficients u, v, w, abs(u) + abs(v) + abs(w) <= n having a negative discriminant.
Terms
- a(0) =0a(1) =1a(2) =5a(3) =11a(4) =25a(5) =39a(6) =69a(7) =99a(8) =143a(9) =189a(10) =265a(11) =327a(12) =437a(13) =529a(14) =653a(15) =777a(16) =965a(17) =1107a(18) =1343a(19) =1531a(20) =1783a(21) =2021a(22) =2367a(23) =2619a(24) =3013a(25) =3343a(26) =3771a(27) =4153a(28) =4707a(29) =5087
External references
- oeis: A381710