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A123932 a(0)=1, a(n)=4 for n>0. 4
1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Continued fraction for sqrt(5)-1.

4^n mod 12. [From Zerinvary Lajos, Nov 25 2009]

LINKS

Table of n, a(n) for n=0..104.

FORMULA

a(n)=4-3*0^n . G.f.: (1+3x)/(1-x).

PROG

(PARI) a(n)=(n>=0)+3*(n>0) [From Jaume Oliver Lafont, Mar 26 2009]

(Sage) [power_mod(4, n, 12)for n in xrange(0, 84)] # [From Zerinvary Lajos, Nov 25 2009]

CROSSREFS

Sequence in context: A136213 A088848 A088849 * A010709 A138908 A032564

Adjacent sequences:  A123929 A123930 A123931 * A123933 A123934 A123935

KEYWORD

cofr,nonn

AUTHOR

Philippe Deléham, Nov 28 2006

STATUS

approved

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Last modified April 15 23:31 EDT 2014. Contains 240534 sequences.