A054187 Number of positive integers <= 2^n of form 7 x^2 + 8 y^2.

0, 0, 0, 2, 3, 5, 9, 17, 30, 57, 105, 199, 373, 701, 1345, 2575, 4954, 9562, 18509, 35916, 69837, 136010, 265251, 518118, 1013282, 1983707, 3887580, 7625434, 14969119, 29407328, 57811961, 113724176, 223843323, 440828855, 868596930

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. A020690.

Sequence in context: A326117 A319380 A213709 * A014743 A345234 A351360

Adjacent sequences: A054184 A054185 A054186 * A054188 A054189 A054190

Keyword

nonn

Author

David W. Wilson

Status

approved