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A135023 (NextPrime[6n]-PreviousPrime[6n])/2. 5
1, 1, 1, 3, 1, 3, 1, 3, 3, 1, 3, 1, 3, 3, 4, 4, 1, 1, 7, 7, 7, 3, 1, 5, 1, 3, 3, 3, 3, 1, 5, 1, 1, 6, 6, 6, 6, 1, 3, 1, 5, 3, 3, 3, 1, 3, 1, 5, 7, 7, 7, 1, 7, 7, 7, 3, 5, 1, 3, 4, 4, 3, 3, 3, 4, 4, 4, 4, 5, 1, 5, 1, 3, 3, 4, 4, 1, 6, 6, 4, 4, 4, 4, 3, 6, 6, 1, 9, 9, 9, 3, 5, 3, 3, 1, 3, 5, 3, 3, 1, 3, 3, 1, 6, 6 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

COMMENTS

a(n)=1 if 6n -/+ 1 are twin primes.

CROSSREFS

Sequence in context: A050345 A070039 A074122 * A087822 A163378 A025810

Adjacent sequences:  A135020 A135021 A135022 * A135024 A135025 A135026

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Feb 10 2008

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Last modified February 18 00:14 EST 2012. Contains 206085 sequences.