Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A143834
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A143834 Numbers n such that 2n^2-1 is not prime +0
2
1, 5, 9, 12, 14, 16, 19, 20, 23, 26, 27, 29, 30, 31, 32, 33, 35, 37, 40, 44, 47, 48, 51, 53, 54, 55, 57, 58, 60, 61, 65, 66, 67, 68, 70, 71, 72, 74, 75, 77, 78, 79, 82, 83, 84, 86, 88, 89, 90, 93, 94, 96, 97, 99, 100, 101, 103, 104, 105, 106, 107, 110, 111, 114, 116, 117 (list; graph; listen)
OFFSET

1,2

COMMENT

Complement of A066049

MATHEMATICA

p = 2; a = {}; Do[k = p x^2 - 1; If[PrimeQ[k], NULL, AppendTo[a, x]], {x, 1, 1000}]; a

CROSSREFS

A066436, A066049, A090686, A090684, A143826, A143827, A143828, A143829, A143830, A143831, A143833

Sequence in context: A062217 A135979 A123574 this_sequence A102183 A106635 A141292

Adjacent sequences: A143831 A143832 A143833 this_sequence A143835 A143836 A143837

KEYWORD

nonn

AUTHOR

Artur Jasinski (grafix(AT)csl.pl), Sep 02 2008

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 17 13:29 EST 2009. Contains 170826 sequences.


AT&T Labs Research