A054164 Number of positive integers <= 2^n of form 3 x^2 + 7 y^2.

0, 0, 1, 2, 4, 8, 13, 24, 44, 79, 147, 275, 516, 976, 1859, 3552, 6810, 13102, 25281, 48908, 94819, 184144, 358279, 698183, 1362298, 2661409, 5204770, 10189097, 19964562, 39151220, 76835090, 150897513, 296542636, 583115721, 1147276480

Offset

0,4

Links

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

Index entries for sequences related to populations of quadratic forms

Crossrefs

Cf. A020679.

Sequence in context: A348574 A227910 A000077 * A226060 A262569 A248876

Adjacent sequences: A054161 A054162 A054163 * A054165 A054166 A054167

Keyword

nonn

Author

David W. Wilson

Status

approved