A020683 - OEIS

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A020683

Numbers of form 4 x^2 + 7 y^2.

0, 4, 7, 11, 16, 23, 28, 32, 36, 43, 44, 63, 64, 67, 71, 79, 92, 99, 100, 107, 112, 116, 127, 128, 144, 148, 151, 163, 172, 175, 176, 179, 191, 196, 203, 207, 211, 212, 224, 239, 252, 256, 259, 263, 268, 275, 284, 288, 308, 316, 319, 324, 331, 343, 347, 352, 359, 368, 371

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..59.

N. J. A. Sloane et al., Binary Quadratic Forms and OEIS (Index to related sequences, programs, references)

CROSSREFS

Sequence in context: A231603 A134869 A171377 * A310758 A310759 A310760

Adjacent sequences: A020680 A020681 A020682 * A020684 A020685 A020686

KEYWORD

easy,nonn

AUTHOR

David W. Wilson

STATUS

approved