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A112744 Least k such that 6*k*p(n)^2 -1 is prime, where p(i)=i-th prime. 2
1, 1, 1, 1, 2, 1, 1, 4, 3, 2, 4, 2, 4, 1, 3, 7, 2, 2, 5, 10, 1, 2, 1, 8, 1, 5, 10, 2, 12, 3, 5, 8, 2, 5, 2, 4, 2, 3, 2, 1, 4, 5, 2, 1, 1, 4, 14, 1, 1, 10, 8, 7, 9, 2, 1, 1, 2, 4, 1, 5, 1, 10, 5, 7, 1, 3, 3, 8, 12, 3, 7, 9, 5, 1, 7, 1, 4, 3, 2, 4, 4, 12, 4, 2, 8, 7, 8, 1, 8, 7, 2, 2, 2, 2, 4, 22, 4, 2, 10, 3, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..101.

MATHEMATICA

Table[k = 1; While[ ! PrimeQ[6*k*Prime[n]^2 - 1], k++ ]; k, {n, 102}] (*Chandler*)

CROSSREFS

Cf. A112745, A112746.

Sequence in context: A074744 A010360 A262357 * A249577 A225924 A078015

Adjacent sequences:  A112741 A112742 A112743 * A112745 A112746 A112747

KEYWORD

nonn

AUTHOR

Pierre CAMI, Sep 18 2005

EXTENSIONS

Extended by Ray Chandler, Oct 08 2005

STATUS

approved

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Last modified January 17 18:48 EST 2019. Contains 319251 sequences. (Running on oeis4.)