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A097009 a[n]=GCD[Prime[2*n]-1,Prime[n]-1]. 0
1, 2, 4, 6, 2, 12, 2, 2, 2, 14, 6, 4, 20, 2, 2, 26, 2, 30, 6, 2, 36, 6, 2, 2, 12, 2, 2, 2, 54, 56, 2, 10, 4, 6, 4, 2, 12, 2, 2, 4, 2, 36, 2, 24, 14, 2, 70, 2, 2, 12, 4, 2, 48, 2, 8, 2, 2, 10, 2, 14, 6, 2, 2, 2, 12, 2, 6, 48, 2, 4, 4, 2, 2, 4, 2, 2, 2, 2, 16, 4, 2, 10, 2, 12, 2, 34, 8, 8, 20, 6, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..92.

CROSSREFS

Sequence in context: A071294 A060684 A056134 * A214213 A085593 A220336

Adjacent sequences:  A097006 A097007 A097008 * A097010 A097011 A097012

KEYWORD

nonn

AUTHOR

Labos Elemer, Jul 26 2004

STATUS

approved

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Last modified December 20 04:40 EST 2014. Contains 252241 sequences.