A054188 Number of positive integers <= 2^n of form 7 x^2 + 9 y^2.

0, 0, 0, 1, 3, 4, 9, 16, 30, 54, 102, 190, 360, 688, 1313, 2535, 4889, 9464, 18376, 35741, 69623, 135899, 265500, 519498, 1017399, 1994552, 3913769, 7685870, 15104369, 29704016, 58451497, 115087453, 226721774, 446861878, 881163356

Offset

0,5

Links

Table of n, a(n) for n=0..34.

Index entries for sequences related to populations of quadratic forms

Crossrefs

Cf. A020691.

Sequence in context: A336450 A367083 A271785 * A093368 A278025 A095095

Adjacent sequences: A054185 A054186 A054187 * A054189 A054190 A054191

Keyword

nonn

Author

David W. Wilson

Status

approved