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A047276
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Numbers that are congruent to {2, 6} mod 7.
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0
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2, 6, 9, 13, 16, 20, 23, 27, 30, 34, 37, 41, 44, 48, 51, 55, 58, 62, 65, 69, 72, 76, 79, 83, 86, 90, 93, 97, 100, 104, 107, 111, 114, 118, 121, 125, 128, 132, 135, 139, 142, 146, 149, 153, 156, 160, 163, 167, 170
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1)
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FORMULA
| a(n)=7*n-a(n-1)-6 (with a(1)=2) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]
G.f. x*(2+4*x+x^2) / ( (1+x)*(x-1)^2 ). - R. J. Mathar, Oct 25 2011
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EXAMPLE
| For n=2, a(2)=7*2-2-6=6; n=3, a(3)=7*3-6-6=9; n=4, a(4)=7*4-9-6=13 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 05 2010]
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CROSSREFS
| Sequence in context: A184621 A184821 A184869 * A171639 A054770 A184745
Adjacent sequences: A047273 A047274 A047275 * A047277 A047278 A047279
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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