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A002481
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Numbers of form x^2 + 6y^2.
(Formerly M3269 N1320)
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11
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0, 1, 4, 6, 7, 9, 10, 15, 16, 22, 24, 25, 28, 31, 33, 36, 40, 42, 49, 54, 55, 58, 60, 63, 64, 70, 73, 79, 81, 87, 88, 90, 96, 97, 100, 103, 105, 106, 112, 118, 121, 124, 127, 132, 135, 144, 145, 150, 151, 154, 159, 160, 166, 168, 169, 175, 177, 186, 193, 196, 198, 199, 202, 214
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| L. Euler, (E388) Vollstaendige Anleitung zur Algebra, Zweiter Theil, reprinted in: Opera Omnia. Teubner, Leipzig, 1911, Series (1), Vol. 1, p. 425.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| Zak Seidov, Table of n, a(n) for n = 1..2064 (with a(n) <= 10000)
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MATHEMATICA
| lim=10000; k=6; Union@Flatten@Table[x^2+k*y^2, {y, 0, Sqrt[lim/k]}, {x, 0, Sqrt[lim-k*y^2]}] (* Zak Seidov, Mar 30 2011 *)
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CROSSREFS
| For prime terms cf. A033199.
Sequence in context: A069909 A189715 A101993 * A183870 A186497 A193627
Adjacent sequences: A002478 A002479 A002480 * A002482 A002483 A002484
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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