|
|
A250181
|
|
Numbers n such that Phi_26(n) is prime, where Phi is the cyclotomic polynomial.
|
|
18
|
|
|
2, 3, 21, 22, 23, 35, 39, 74, 80, 84, 89, 108, 114, 121, 126, 134, 152, 153, 171, 180, 195, 204, 230, 256, 263, 297, 321, 326, 336, 342, 345, 351, 368, 390, 393, 397, 398, 399, 413, 427, 439, 490, 525, 563, 566, 574, 591, 602, 609, 630, 641, 652, 657, 660, 667, 682, 685, 694, 708, 712, 716, 721
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MAPLE
|
select(t -> isprime((t^13+1)/(t+1)), [$1..2000]); # Robert Israel, Jan 15 2015
|
|
MATHEMATICA
|
Select[Range[2000], PrimeQ[(#^13 + 1) / (# + 1)] &] (* Vincenzo Librandi, Jan 15 2015 *)
|
|
PROG
|
(Magma) [n: n in [1..2000]| IsPrime((n^13+1) div (n+1))]; // Vincenzo Librandi, Jan 15 2015
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|