A175921 - OEIS

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A175921

Period 5: repeat [1, 2, 2, -1, 1].

1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1, 1

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..75.

Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,1).

MATHEMATICA

PadRight[{}, 120, {1, 2, 2, -1, 1}] (* Harvey P. Dale, Dec 30 2016 *)

PROG

(PARI) a(n)=[1, 1, 2, 2, -1][n%5+1] \\ Charles R Greathouse IV, Mar 12 2017

CROSSREFS

Cf. A040001, A028356, A142150, A000012, A175922.

Sequence in context: A039998 A316089 A000999 * A303828 A025451 A184257

Adjacent sequences: A175918 A175919 A175920 * A175922 A175923 A175924

KEYWORD

sign,easy,less

AUTHOR

Jaroslav Krizek, Oct 17 2010

EXTENSIONS

Edited by Joerg Arndt, Sep 16 2013

STATUS

approved