A054150 Number of positive integers <= 2^n of the form x^2 + 5*y^2.

1, 1, 2, 4, 7, 13, 22, 40, 73, 132, 245, 458, 864, 1638, 3123, 5979, 11484, 22140, 42773, 82865, 160809, 312659, 608857, 1187323, 2318344, 4531879, 8867913, 17369053, 34048772, 66799240, 131146379, 257651913, 506503984, 996288321

Offset: 0

Author

David W. Wilson

Keywords

• nonn

Links

• Index entries for sequences related to populations of quadratic forms

Crossrefs

Cf. A020669.