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A120393
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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.
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1
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1, 1, 5, 1, 14, 5, 86, 130, 139, 54, 1227
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| The p sequence starts 5,29,21169,448147729
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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
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CROSSREFS
| Cf. A143181.
Sequence in context: A174504 A067558 A104792 * A094368 A087727 A039807
Adjacent sequences: A120390 A120391 A120392 * A120394 A120395 A120396
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KEYWORD
| nonn
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AUTHOR
| Pierre CAMI (pierre-cami(AT)bbox.fr), Jul 01 2006, Jul 28 2008
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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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