|
|
A032478
|
|
Numbers k such that 203*2^k + 1 is prime.
|
|
0
|
|
|
13, 25, 29, 33, 45, 57, 65, 153, 197, 245, 637, 1785, 1917, 2045, 4925, 5313, 7449, 8437, 23645, 28273, 34217, 40189, 135125, 141477, 169077, 215945, 234229, 265089, 482177, 556069, 1335989, 1357425, 1966689, 2526505
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
Select[Range[0, 1000], PrimeQ[203*2^# + 1] &] (* Robert Price, Dec 09 2018 *)
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,hard
|
|
AUTHOR
|
|
|
EXTENSIONS
|
a(25)-a(32) from Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 09 2018
a(33) from updated Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 10 2018
|
|
STATUS
|
approved
|
|
|
|