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A047276 Numbers that are congruent to {2, 6} mod 7. 7
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, 174, 177, 181, 184, 188, 191, 195, 198, 202, 205 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Index entries for linear recurrences with constant coefficients, signature (1,1,-1)

FORMULA

a(n) = 7*n - a(n-1) - 6 (with a(1)=2). - Vincenzo Librandi, Aug 05 2010

G.f.: x*(2 + 4*x + x^2) / ( (1+x)*(x-1)^2 ). - R. J. Mathar, Oct 25 2011

a(n) = 3*n + floor(n/2) - 1. - Arkadiusz Wesolowski, Sep 19 2012

CROSSREFS

Sequence in context: A184821 A292659 A184869 * A171639 A054770 A184745

Adjacent sequences:  A047273 A047274 A047275 * A047277 A047278 A047279

KEYWORD

nonn,easy,changed

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified May 14 19:25 EDT 2021. Contains 343901 sequences. (Running on oeis4.)