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A126612 a(n) = least K such that K*6*M(n) - 1 and K*6*M(n) + 1 are twin primes, where M(n) = n-th Mersenne prime. 0
1, 1, 7, 24, 12, 52, 24, 39, 252, 112, 371, 184, 5772, 61939, 151505 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

7*6*(2^5-1)-1=1301 prime, 1301 and 1303 twin primes so K(3)=7 as M(3)=2^5-1

CROSSREFS

Cf. A000043.

Sequence in context: A129662 A012482 A124985 * A196113 A286506 A286406

Adjacent sequences:  A126609 A126610 A126611 * A126613 A126614 A126615

KEYWORD

nonn

AUTHOR

Pierre CAMI, Feb 08 2007

STATUS

approved

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Last modified March 19 11:08 EDT 2019. Contains 321329 sequences. (Running on oeis4.)