A143385 - OEIS

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A143385

Least a(n) such that M(n)*(M(n)+a(n))-1 and M(n)*(M(n)+a(n))+1 are twin primes with M(i)=i-th Mersenne prime.

1, 53, 11, 17, 317, 89, 737, 2543, 1247, 6209, 15107, 33119, 60611, 671063, 2648057 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..15.`
	EXAMPLE	`(2^2-1)*(2^2-1+1)-1=11 prime, 11 and 13 twin primes, 2^2-1=M(1) so a(1)=1`
	CROSSREFS	`Cf. A139426.` `Sequence in context: A078681 A143294 A143428 * A231426 A298061 A297984` `Adjacent sequences: A143382 A143383 A143384 * A143386 A143387 A143388`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Pierre CAMI, Aug 11 2008`
	STATUS	`approved`

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Last modified December 5 21:07 EST 2023. Contains 367594 sequences. (Running on oeis4.)