|
| |
|
|
A138580
|
|
Numbers n such that 2^(2*n-13)-13 is prime.
|
|
0
|
| |
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Table of n, a(n) for n=1..9.
|
|
|
EXAMPLE
|
2^(2*11-13)-13=499, 2^(2*13-13)-13=8179, 2^(2*15-13)-13=131059, ...
|
|
|
MATHEMATICA
|
q=13; For[i=q, i<=q, a={}; Do[x=2^(2*n-i)-i; If[PrimeQ[x], AppendTo[a, n]], {n, 10^2}]; Print["2^(2*n-", i, ")-", i, " ", a]; i=i+2]
|
|
|
PROG
|
(PARI) is(n)=isprime(2^(2*n-13)-13) \\ Charles R Greathouse IV, Jun 13 2017
|
|
|
CROSSREFS
|
Sequence in context: A196040 A196043 A030569 * A192050 A045158 A074328
Adjacent sequences: A138577 A138578 A138579 * A138581 A138582 A138583
|
|
|
KEYWORD
|
nonn,easy
|
|
|
AUTHOR
|
Vladimir Joseph Stephan Orlovsky, May 13 2008
|
|
|
STATUS
|
approved
|
| |
|
|
