login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A032493 Numbers n such that 233*2^n+1 is prime. 0
1, 5, 9, 13, 17, 25, 33, 53, 57, 77, 521, 593, 609, 845, 917, 985, 1321, 1801, 3565, 4953, 5137, 13193, 14173, 15517, 15629, 21853, 22009, 24625, 40041, 47797, 50257, 52433, 114881 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..33.

Ray Ballinger, Proth Search Page

Ray Ballinger and Wilfrid Keller, List of primes k.2^n + 1 for k < 300

Wilfrid Keller, List of primes k.2^n - 1 for k < 300

Index entries for sequences of n such that k*2^n-1 (or k*2^n+1) is prime

CROSSREFS

Sequence in context: A187573 A057653 A085759 * A125018 A074787 A255645

Adjacent sequences:  A032490 A032491 A032492 * A032494 A032495 A032496

KEYWORD

nonn,hard

AUTHOR

N. J. A. Sloane.

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 5 15:57 EST 2016. Contains 278770 sequences.