A135053 - OEIS

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A135053

Greatest integer M(i)=n such that A085427(n)=A085427(n-1)/2 and k(i+1)>k(i) with A085427(n)=least k such that k*2^n-1 is prime ( Mersenne prime when k=1).

2, 21, 23, 80, 96, 111, 168, 230, 281, 347, 558, 704 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	EXAMPLE	`A085427 =3,2,1,1,2,1,2,1,5,7,5,3,2,1,5,4,2,1,2,1,14,7,26,13,39,22` `A(2)=1,A(1)=2 so A(2)=A(1)/2 so M(1)=1` `A(5)=1,A(4)=2 but A(5)=A(2) ..........` `A(21)=7,A(20)=14 A(21)=A(20)/2 and A(21)>A(2) so M(2)=21`
	CROSSREFS	`Cf. A087425, A135054.` `Sequence in context: A037315 A110301 A041513 * A042565 A079907 A075715` `Adjacent sequences: A135050 A135051 A135052 * A135054 A135055 A135056`
	KEYWORD	`nonn,uned`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)bbox.fr), Nov 15 2007`

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Last modified February 18 00:14 EST 2012. Contains 206085 sequences.