A054233 Number of positive integers <= 2^n of form x^2 + 20 y^2.

1, 1, 2, 2, 4, 9, 14, 26, 47, 85, 158, 295, 552, 1048, 2000, 3829, 7373, 14216, 27505, 53378, 103728, 201981, 393900, 769192, 1503947, 2943906, 5767973, 11311511, 22200845, 43605974, 85707102, 168564864, 331720141, 653151962, 1286702079

Offset

0,3

Links

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

Crossrefs

Sequence in context: A105152 A066346 A175390 * A054231 A054230 A054232

Adjacent sequences: A054230 A054231 A054232 * A054234 A054235 A054236

Keyword

nonn

Author

David W. Wilson

Status

approved