login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A054171 Number of positive integers <= 2^n of form 4 x^2 + 7 y^2. 0
0, 0, 1, 2, 4, 7, 12, 23, 41, 77, 142, 270, 504, 958, 1834, 3505, 6752, 13016, 25170, 48775, 94718, 184210, 358805, 699919, 1366853, 2672452, 5230345, 10245791, 20088113, 39415538, 77394348, 152067981, 298975703, 588143637, 1157617442 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

Index entries for sequences related to populations of quadratic forms

CROSSREFS

Sequence in context: A099604 A026790 A054165 * A018080 A226160 A018181

Adjacent sequences:  A054168 A054169 A054170 * A054172 A054173 A054174

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 17 11:49 EST 2022. Contains 350394 sequences. (Running on oeis4.)