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A054229 Number of positive integers <= 2^n of form x^2 + 15 y^2. 0
1, 1, 2, 2, 5, 9, 16, 27, 52, 91, 173, 322, 606, 1152, 2191, 4191, 8060, 15540, 30018, 58161, 112891, 219479, 427440, 833615, 1627752, 3182068, 6226916, 12196740, 23910690, 46911434, 92104753, 180957883, 355748937, 699779680, 1377255678 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

CROSSREFS

Sequence in context: A096569 A076607 A325104 * A212812 A214727 A302483

Adjacent sequences:  A054226 A054227 A054228 * A054230 A054231 A054232

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified February 20 20:31 EST 2020. Contains 332084 sequences. (Running on oeis4.)