login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A100911 Numbers k such that (3*2^k - 1)^2 - 2 is prime. 1
0, 1, 4, 6, 15, 21, 25, 70, 129, 399, 511, 856, 9574, 14479, 17649, 27054, 28296, 32796, 38176 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Next term > 100000.
a(1)-a(12) have been proved with PARI's ECPP; all subsequent terms correspond to BPSW PRPs. - Lucas A. Brown, Mar 28 2021
LINKS
Lucas A. Brown, A100911.py
PROG
(PARI) is(n)=ispseudoprime((3*2^n-1)^2-2) \\ Charles R Greathouse IV, Feb 19 2016
CROSSREFS
Sequence in context: A266883 A034764 A119034 * A346297 A034765 A300276
KEYWORD
nonn,more
AUTHOR
Ray Chandler, Nov 21 2004
EXTENSIONS
a(1), a(14)-a(19) by Lucas A. Brown, Mar 28 2021
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 19 14:04 EDT 2024. Contains 371792 sequences. (Running on oeis4.)