login
A112744
Least k such that 6*k*prime(n)^2 -1 is prime, where prime(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
OFFSET
1,5
MATHEMATICA
Table[k = 1; While[ ! PrimeQ[6*k*Prime[n]^2 - 1], k++ ]; k, {n, 102}] (* Ray Chandler, Oct 08 2005 *)
CROSSREFS
Sequence in context: A369588 A010360 A262357 * A249577 A225924 A078015
KEYWORD
nonn
AUTHOR
Pierre CAMI, Sep 18 2005
EXTENSIONS
Extended by Ray Chandler, Oct 08 2005
STATUS
approved