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A069927
Numbers k that divide 2^(k+3) - 1.
3
3, 5, 9, 21, 45, 63, 85, 105, 117, 273, 285, 357, 585, 627, 765, 1365, 1397, 1449, 1677, 1989, 2337, 3597, 3705, 3885, 4221, 4365, 4485, 4797, 4953, 5061, 5607, 5797, 7137, 7521, 7565, 7665, 8109, 10197, 10545, 10845, 11445, 11565, 12597, 13065, 13717
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[15000], PowerMod[2, #+3, #]==1&] (* Harvey P. Dale, Jul 09 2018 *)
CROSSREFS
Sequence in context: A053662 A050355 A147039 * A136401 A147758 A129787
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Apr 25 2002
STATUS
approved