a(n) is the smallest nonnegative integer k where there are exactly n nonnegative integer solutions to x^2 + 5*y^2 = k.

A374288

a(n) is the smallest nonnegative integer k where there are exactly n nonnegative integer solutions to x^2 + 5*y^2 = k.

Terms

    a(0) =2a(1) =0a(2) =9a(3) =81a(4) =189a(5) =441a(6) =1449a(7) =10206a(8) =3969a(9) =12789a(10) =13041a(11) =35721a(12) =30429a(13) =194481a(14) =117369a(15) =115101a(16) =186921a(17) =2893401a(18) =273861

External references