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A047449
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Numbers that are primitively represented by x^2+y^2+z^2.
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7
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1, 2, 3, 5, 6, 9, 10, 11, 13, 14, 17, 18, 19, 21, 22, 25, 26, 27, 29, 30, 33, 34, 35, 37, 38, 41, 42, 43, 45, 46, 49, 50, 51, 53, 54, 57, 58, 59, 61, 62, 65, 66, 67, 69, 70, 73, 74, 75, 77, 78, 81, 82, 83, 85, 86, 89, 90, 91, 93, 94, 97, 98, 99, 101, 102, 105, 106
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (1,0,0,0,1,-1)
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FORMULA
| Numbers that are congruent to {1, 2, 3, 5, 6} mod 8.
Union of A047449 and A034045 is A000378. Intersection of A047449 and A034043 is A034046. Numbers that are in A000378 and not congruent to 0 mod 4. - Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 05 2004
G.f. x*(1+x+x^2+2*x^3+x^4+2*x^5) / ( (x^4+x^3+x^2+x+1)*(x-1)^2 ). - R. J. Mathar, Dec 07 2011
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CROSSREFS
| Cf. A000378, A004215, A034043-A034047.
Sequence in context: A131292 A069880 A069861 * A162923 A107040 A045989
Adjacent sequences: A047446 A047447 A047448 * A047450 A047451 A047452
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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