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A112745 Least k such that 6*k*prime(n)^2 +1 is prime, where prime(i)=i-th prime. 2
3, 2, 1, 3, 1, 2, 2, 5, 4, 2, 3, 8, 2, 2, 4, 7, 1, 8, 3, 2, 2, 1, 13, 1, 2, 10, 5, 3, 1, 4, 2, 1, 9, 3, 5, 2, 14, 3, 9, 3, 3, 10, 1, 5, 4, 1, 2, 2, 2, 6, 3, 2, 1, 10, 5, 7, 1, 3, 10, 6, 2, 7, 7, 8, 5, 3, 3, 3, 2, 6, 12, 1, 2, 3, 12, 4, 1, 3, 5, 6, 2, 2, 1, 3, 1, 3, 3, 4, 2, 14, 7, 26, 9, 2, 12, 3, 5, 5, 7, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
Table[k = 1; While[ ! PrimeQ[6*k*Prime[n]^2 + 1], k++ ]; k, {n, 100}] (* Ray Chandler, Oct 08 2005 *)
CROSSREFS
Sequence in context: A265027 A079587 A237881 * A205564 A036585 A260454
KEYWORD
nonn
AUTHOR
Pierre CAMI, Sep 18 2005
EXTENSIONS
Extended by Ray Chandler, Oct 08 2005
STATUS
approved

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Last modified June 17 03:50 EDT 2024. Contains 373432 sequences. (Running on oeis4.)