Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A103356
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A103356 Least k such that k*((p(n)#)^2)-1 is prime with p(i)#=i-th primorial. +0
1
1, 2, 3, 3, 6, 17, 13, 13, 5, 6, 2, 11, 14, 15, 3, 7, 77, 6, 20, 53, 52, 6, 13, 8, 41, 52, 24, 26, 31, 41, 5, 31, 21, 28, 43, 57, 11, 18, 47, 19, 8, 33, 24, 30, 43, 10, 17, 213, 29, 15, 45, 60, 50, 26, 48, 18, 18, 78, 8, 59, 13, 33, 145, 23, 154, 79, 65, 21, 18, 23, 30, 19, 159, 46, 45 (list; graph; listen)
OFFSET

1,2

EXAMPLE

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

1*((2*3)^2)-1=35 composite

2*((2*3)^2)-1=71 prime so a(2)=2

1*((2*3*5)^2)-1=899 composite

2*((2*3*5)^2)-1=1799 composite

3*((2*3*5)^2)-1=2699 prime so a(3)=3

CROSSREFS

Sequence in context: A054630 A049875 A087989 this_sequence A028257 A100228 A111003

Adjacent sequences: A103353 A103354 A103355 this_sequence A103357 A103358 A103359

KEYWORD

nonn

AUTHOR

Pierre CAMI (pierrecami(AT)tele2.fr), Mar 20 2005

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 December 16 17:18 EST 2009. Contains 170825 sequences.


AT&T Labs Research