A135054 - OEIS

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A135054

Greatest integer K(i)=A085427(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).

1, 7, 13, 15, 17, 75, 102, 173, 181, 229, 513, 539 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	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 K(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 K(2)=7`
	CROSSREFS	`Cf. A087425, A135053.` `Sequence in context: A120100 A104217 A191976 * A076701 A076196 A167782` `Adjacent sequences: A135051 A135052 A135053 * A135055 A135056 A135057`
	KEYWORD	`nonn,uned`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)bbox.fr), Nov 15 2007`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.