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A120393 Sequence a(n) defined as follows: let p(0) = 2 be the first prime; then p(n+1) = least prime of the form a(n)*p(n)*(a(n)*p(n)+1)-1. +0
2
1, 1, 5, 1, 14, 5, 86, 130, 139, 54, 1227 (list; graph; listen)
OFFSET

1,3

COMMENT

The p sequence starts 5,29,21169,448147729

EXAMPLE

1*2*(1*2+1)-1=5 prime so a(1)=1

1*5*(1*5+1)-1=29 prime so a(2)=1

CROSSREFS

Cf. A143181.

Sequence in context: A146620 A067558 A104792 this_sequence A094368 A087727 A039807

Adjacent sequences: A120390 A120391 A120392 this_sequence A120394 A120395 A120396

KEYWORD

nonn

AUTHOR

Pierre CAMI (pierrecami(AT)tele2.fr), Jul 01 2006, Jul 28 2008

EXTENSIONS

Edited by N. J. A. Sloane (njas(AT)research.att.com), Aug 13 2008 at the suggestion of R. J. Mathar

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.


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