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A029854 gcd(prime(n)+prime(n+1), prime(n+1)+prime(n+2)). 1
1, 4, 6, 6, 6, 6, 6, 2, 4, 4, 2, 6, 6, 10, 4, 8, 8, 2, 6, 8, 2, 2, 2, 6, 6, 6, 6, 6, 6, 6, 2, 4, 12, 12, 4, 4, 10, 10, 4, 8, 12, 12, 6, 6, 2, 2, 2, 6, 6, 2, 8, 12, 4, 4, 4, 4, 4, 2, 6, 12, 24, 6, 6, 6, 18, 4, 4, 12, 6, 2, 2, 2, 4, 2, 2, 2, 6, 6, 18, 12, 12, 12, 8 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

a(n) = gcd(A001043(n), A001043(n+1)).

EXAMPLE

a(20) = gcd(71+73, 73+79) = gcd(144,152) = 8*gcd(18,19) = 8.

CROSSREFS

Sequence in context: A081261 A046262 A147862 * A141328 A035551 A087573

Adjacent sequences:  A029851 A029852 A029853 * A029855 A029856 A029857

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 14, 2002

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Last modified February 13 14:42 EST 2012. Contains 205514 sequences.