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A047623
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Numbers that are congruent to {1, 3, 5} mod 8.
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0
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1, 3, 5, 9, 11, 13, 17, 19, 21, 25, 27, 29, 33, 35, 37, 41, 43, 45, 49, 51, 53, 57, 59, 61, 65, 67, 69, 73, 75, 77, 81, 83, 85, 89, 91, 93, 97, 99, 101, 105, 107, 109, 113, 115, 117, 121, 123, 125, 129, 131, 133, 137
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(n) = 2*floor((n-1)/3) +2*n -1. - Gary Detlefs (gdetlefs(AT)aol.com), Mar 18 2010
G.f.: x*(1+2*x+2*x^2+3*x^3)/(1-x-x^3+x^4). a(n) = a(n-1)+a(n-3)-a(n-4). - Colin Barker, Feb 03 2012
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CROSSREFS
| Sequence in context: A162699 A173263 A141231 * A190523 A161781 A007950
Adjacent sequences: A047620 A047621 A047622 * A047624 A047625 A047626
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KEYWORD
| nonn,easy,changed
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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