Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A059242
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A059242 Numbers n such that 2^n + 5 is prime. +0
6
1, 3, 5, 11, 47, 53, 141, 143, 191, 273, 341, 16541 (list; graph; listen)
OFFSET

1,2

EXAMPLE

2^3 + 5 = 13 is prime but 2^4 + 5 = 21 is not.

CROSSREFS

Sequence in context: A105236 A144467 A049883 this_sequence A004203 A088884 A058029

Adjacent sequences: A059239 A059240 A059241 this_sequence A059243 A059244 A059245

KEYWORD

nonn,hard

AUTHOR

Tony Davie (ad(AT)dcs.st-and.ac.uk), Jan 21 2001

EXTENSIONS

More terms from Santi Spadaro, Oct 04, 2002

16541 from Hans Havermann, Oct 07 2002

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 2 15:58 EST 2008. Contains 150992 sequences.


AT&T Labs Research