Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A118664
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A118664 Least prime p such that n*(p#^2)-1 is prime or 0 if n is a square so no prime possible. +0
1
2, 2, 2, 0, 2, 2, 3, 2, 0, 3, 2, 2, 3, 3, 2, 0, 2, 2, 3, 2, 2, 269, 3, 3, 0, 2, 2, 7, 5, 29, 11, 2, 2, 3, 2, 0, 11, 2, 5, 3, 2, 2, 5, 3, 2, 5, 5, 2, 0, 2, 17, 3, 2, 11, 3, 2, 2, 3, 7, 2, 7, 5, 2, 0, 3, 2, 3, 2, 5, 7, 2, 3, 5, 3, 3, 5, 2, 2, 3, 3, 0, 41, 2, 3, 7, 7, 2, 3, 3, 2, 5, 2, 3, 53, 2, 2, 3, 3, 7, 0 (list; graph; listen)
OFFSET

1,1

EXAMPLE

1*(2^2)-1=3 prime so a(1)=2

7*(2^2)-1=27 composite

7*((2*3)^2)-1=251 prime so a(7)=3

CROSSREFS

Sequence in context: A108352 A036476 A104994 this_sequence A118205 A130277 A109135

Adjacent sequences: A118661 A118662 A118663 this_sequence A118665 A118666 A118667

KEYWORD

nonn

AUTHOR

Pierre CAMI (pierrecami(AT)tele2.fr), May 19 2006

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified November 18 20:14 EST 2008. Contains 147244 sequences.


AT&T Labs Research