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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). +0
2
1, 7, 13, 15, 17, 75, 102, 173, 181, 229, 513, 539 (list; graph; listen)
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: A072864 A120100 A104217 this_sequence A076701 A076196 A167782

Adjacent sequences: A135051 A135052 A135053 this_sequence A135055 A135056 A135057

KEYWORD

nonn,uned

AUTHOR

Pierre CAMI (pierrecami(AT)tele2.fr), Nov 15 2007

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.


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