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A047374 Numbers that are congruent to {4, 5} mod 7. 0
4, 5, 11, 12, 18, 19, 25, 26, 32, 33, 39, 40, 46, 47, 53, 54, 60, 61, 67, 68, 74, 75, 81, 82, 88, 89, 95, 96, 102, 103, 109, 110, 116, 117, 123, 124, 130, 131, 137, 138, 144, 145, 151, 152, 158, 159, 165, 166, 172 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..49.

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

FORMULA

a(n) = 7*n-a(n-1)-5, n>1. - Vincenzo Librandi, Aug 05 2010

G.f.: x*(4+x+2*x^2) / ( (1+x)*(x-1)^2 ). - R. J. Mathar, Dec 04 2011

a(n) = -(5/4)*(-1)^(n-1) + 7*(n-1)/2 + 11/4. - Viet Quoc Le Tran, Jun 14 2014

CROSSREFS

Sequence in context: A188053 A261673 A027708 * A241653 A100107 A066828

Adjacent sequences:  A047371 A047372 A047373 * A047375 A047376 A047377

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 20 06:26 EST 2019. Contains 320332 sequences. (Running on oeis4.)