login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A108249
Consider primes p and q such that p = 3^k + 20 and q = 3^(k+1) + 20 for some k; sequence gives values of p.
1
23, 29, 47, 101, 2207, 59069
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
1,1
LINKS
Table of n, a(n) for n=1..6.
EXAMPLE
3^1 + 20 = 23, 3^2 + 20 = 29.
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", ") ) ) }
CROSSREFS
Cf.
A108258
.
Sequence in context:
A108111
A085713
A102904
*
A338324
A232725
A045120
Adjacent sequences:
A108246
A108247
A108248
*
A108250
A108251
A108252
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 April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)