|
|
A173063
|
|
Numbers n such that 2^n + n - 1 is a prime.
|
|
1
|
|
|
1, 2, 4, 8, 10, 16, 86, 344, 406, 424, 2324, 6358, 11026, 11804, 48926, 266744
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
The associated prime list is 2, 5, 19, 263, 1033, 65551, 77371252455336267181195349 etc.
|
|
LINKS
|
|
|
EXAMPLE
|
For n=2, 2^2+2-1=5 is prime. For n=4, 2^4+4-1=19 is prime.
|
|
MATHEMATICA
|
fQ[n_] := PrimeQ[ 2^n + n - 1]; k = 1; lst = {}; While[k < 35000, If[ fQ@k, AppendTo[ lst, k]; Print@k]; k ++ ] (* Robert G. Wilson v, Feb 26 2010 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
Definition corrected, leading 1 inserted, 5 terms appended - R. J. Mathar, Feb 13 2010
|
|
STATUS
|
approved
|
|
|
|