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A066984 Gcd(prime(n+1)-1, prime(n)+1). +0
1
1, 4, 6, 2, 12, 2, 18, 2, 4, 30, 4, 2, 42, 2, 4, 2, 60, 2, 2, 72, 2, 2, 4, 6, 2, 102, 2, 108, 2, 6, 2, 4, 138, 4, 150, 4, 2, 2, 4, 2, 180, 2, 192, 2, 198, 10, 2, 2, 228, 2, 2, 240, 2, 4, 2, 4, 270, 4, 2, 282, 4, 6, 2, 312, 2, 6, 4, 2, 348, 2, 2, 6, 4, 2, 2, 4, 6, 2, 6, 2, 420, 2, 432, 2, 2 (list; graph; listen)
OFFSET

1,2

CROSSREFS

Sequence in context: A159193 A118967 A059030 this_sequence A085595 A054222 A066891

Adjacent sequences: A066981 A066982 A066983 this_sequence A066985 A066986 A066987

KEYWORD

nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 27 2002

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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