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A112746 Least k such that 6*k*p(n)^2 -1 and 6*k*p(n)^2 +1 are twin primes where p(i)=i-th prime. 2
3, 2, 1, 3, 2, 2, 2, 20, 22, 2, 12, 10, 28, 32, 8, 7, 20, 15, 15, 12, 5, 3, 68, 15, 33, 12, 10, 3, 23, 28, 130, 8, 13, 32, 38, 7, 57, 3, 25, 3, 8, 18, 77, 12, 65, 22, 18, 18, 2, 10, 18, 30, 110, 10, 10, 28, 15, 22, 37, 7, 2, 10, 7, 8, 48, 3, 3, 87, 103, 128, 30, 13, 23, 127, 12, 15, 8, 3 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

MATHEMATICA

Table[k = 1; While[c = 6*k*Prime[n]^2; ! PrimeQ[c - 1] || ! PrimeQ[c + 1], k++ ]; k, {n, 80}] (*Chandler*)

CROSSREFS

Cf. A112744, A112745.

Sequence in context: A119910 A138034 A087818 * A107460 A152975 A128262

Adjacent sequences:  A112743 A112744 A112745 * A112747 A112748 A112749

KEYWORD

nonn

AUTHOR

Pierre CAMI (pierre-cami(AT)bbox.fr), Sep 18 2005

EXTENSIONS

Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 08 2005

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Last modified February 14 10:24 EST 2012. Contains 205614 sequences.