A054180 Number of positive integers <= 2^n of form 5 x^2 + 10 y^2.

0, 0, 0, 1, 3, 5, 9, 16, 29, 52, 93, 169, 315, 591, 1119, 2124, 4052, 7763, 14922, 28781, 55629, 107775, 209241, 406916, 792579, 1545812, 3018687, 5901609, 11549484, 22623452, 44352970, 87021370, 170860941, 335698520, 659971004, 1298228239

Offset

0,5

Links

Table of n, a(n) for n=0..35.

Index entries for sequences related to populations of quadratic forms

Crossrefs

Sequence in context: A295060 A069818 A227233 * A188223 A348125 A135575

Adjacent sequences: A054177 A054178 A054179 * A054181 A054182 A054183

Keyword

nonn

Author

David W. Wilson

Status

approved