|
| |
|
|
A138582
|
|
Numbers n such that 2^(2*n-19)-19 is prime.
|
|
0
|
|
|
|
10, 11, 12, 13, 15, 17, 19, 20, 25, 29, 43, 44, 52, 88, 95, 105, 137, 155, 199
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Table of n, a(n) for n=1..19.
|
|
|
EXAMPLE
|
2^(2*15-19)-19=2029, 2^(2*17-19)-19=32749, ...
|
|
|
MATHEMATICA
|
q=19; 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-19)-19) \\ Charles R Greathouse IV, Jun 13 2017
|
|
|
CROSSREFS
|
Sequence in context: A270040 A339093 A072554 * A215059 A308105 A066309
Adjacent sequences: A138579 A138580 A138581 * A138583 A138584 A138585
|
|
|
KEYWORD
|
nonn,easy
|
|
|
AUTHOR
|
Vladimir Joseph Stephan Orlovsky, May 13 2008
|
|
|
STATUS
|
approved
|
| |
|
|
