login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A108271
Consider primes p and q such that p = 2^k + 15 and q = 2^(k+1) + 15 for some k; sequence gives values of q.
1
19, 23, 31, 47, 79, 2063, 4111, 65551, 8388623
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
1,1
LINKS
Table of n, a(n) for n=1..9.
PROG
(PARI) g(m, n, b) = { for(x=0, n, y=m+b^x+b%2; z=m+b^(x+1)+b%2; if(isprime(y)&isprime(z), print1(y", ") ) ) }
(Magma) for k in [0..100] do p:=2^k+15; q:=2^(k+1)+15; if IsPrime(p) and IsPrime(q) then q; end if; end for;
CROSSREFS
Cf.
A108266
.
Sequence in context:
A007639
A261311
A168144
*
A351121
A245585
A343741
Adjacent sequences:
A108268
A108269
A108270
*
A108272
A108273
A108274
KEYWORD
nonn
AUTHOR
Cino Hilliard
, Jun 29 2005
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 July 21 06:08 EDT 2024. Contains 374463 sequences. (Running on oeis4.)