|
|
A217072
|
|
Numbers n such that (n^19-1)/(n-1) is prime.
|
|
8
|
|
|
2, 10, 11, 12, 14, 19, 24, 40, 45, 46, 48, 65, 66, 67, 75, 85, 90, 103, 105, 117, 119, 137, 147, 164, 167, 179, 181, 205, 220, 235, 242, 253, 254, 263, 268, 277, 303, 315, 332, 337, 366, 369, 370, 389, 399, 404, 424, 431, 446, 449, 480, 481, 506, 509, 521, 523
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
Select[Range[2, 1000], PrimeQ[(#^19 - 1)/(# - 1)] &] (* T. D. Noe, Sep 26 2012 *)
|
|
PROG
|
(Magma) [n: n in [2..1000] |IsPrime((n^19 - 1) div (n - 1))]; // Vincenzo Librandi, Sep 28 2012
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|