|
|
A319538
|
|
Numbers k such that k divides 2^(2*k+1) - 1.
|
|
0
|
|
|
1, 7, 217, 1057, 3937, 10447, 24601, 32767, 91657, 145337, 279527, 666967, 1412113, 2484247, 2874847, 3124327, 4169137, 4472167, 9526207, 12021439, 16539337, 16646017, 19384207, 20139367, 24639727, 28127137, 28940887, 30583087, 66131279, 68068777, 70694167, 72299857, 72903847, 73498471, 87507049
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
Sequence is infinite because 2^A187787(t) - 1 is a term for all t >= 1.
|
|
LINKS
|
|
|
MATHEMATICA
|
|
|
PROG
|
(PARI) isok(n) = Mod(2, n)^(2*n+1)==1;
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|