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A112132 Period 4: repeat 1 3 1 7. +0
2
1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3, 1, 7, 1, 3 (list; graph; listen)
OFFSET

1,2

FORMULA

a(n)=2*(n mod 4)-[(n+1) mod 4]+[(n+2) mod 4], with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Aug 29 2007

a(n)=3+I*I^n-2*(-1)^n-I*(-I)^n, with n>=0 and I=sqrt(-1) - Paolo P. Lava (ppl(AT)spl.at), Jul 17 2008

CROSSREFS

First differences of A112062.

Also half of the first differences of A112072. Cf. A112086.

Sequence in context: A097612 A136011 A021991 this_sequence A053381 A038712 A065745

Adjacent sequences: A112129 A112130 A112131 this_sequence A112133 A112134 A112135

KEYWORD

nonn

AUTHOR

Antti Karttunen (His-Firstname.His-Surname(AT)iki.fi), Aug 28 2005

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Last modified August 28 11:49 EDT 2008. Contains 143094 sequences.


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