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A147677 Subtract 5, add 8, repeat. 1
7, 2, 10, 5, 13, 8, 16, 11, 19, 14, 22, 17, 25, 20, 28, 23, 31, 26, 34, 29, 37, 32, 40, 35, 43, 38, 46, 41, 49, 44, 52, 47, 55, 50, 58, 53, 61, 56, 64, 59, 67, 62, 70, 65, 73, 68, 76, 71, 79, 74, 82, 77, 85, 80, 88, 83, 91, 86, 94, 89, 97, 92, 100, 95, 103, 98, 106, 101, 109 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A147675-A147678 are from a quiz that someone asked me to help them with.

LINKS

Table of n, a(n) for n=1..69.

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

FORMULA

From Zak Seidov, Apr 22 2009: (Start)

a(n) = a(n-2) + 3.

a(n) = (1/4)*(6*n + 9 - 13*(-1)^n).

(End)

From R. J. Mathar, Apr 22 2009: (Start)

a(n) = a(n-1) + a(n-2) - a(n-3) = 3*n/2 + 9/4 + 13*(-1)^(n+1)/4.

G.f.: x*(7-5*x+x^2)/((1+x)*(x-1)^2). (End)

MATHEMATICA

LinearRecurrence[{1, 1, -1}, {7, 2, 10}, 80] (* Harvey P. Dale, Jan 16 2015 *)

CROSSREFS

Sequence in context: A021141 A246948 A248283 * A090243 A216150 A145338

Adjacent sequences:  A147674 A147675 A147676 * A147678 A147679 A147680

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 21 2009

EXTENSIONS

More terms from Zak Seidov and R. J. Mathar, Apr 22 2009

STATUS

approved

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Last modified March 23 04:46 EDT 2019. Contains 321422 sequences. (Running on oeis4.)