A069927 Numbers k that divide 2^(k+3) - 1.

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

Harvey P. Dale, Table of n, a(n) for n = 1..500

Mathematica

Select[Range[15000], PowerMod[2, #+3, #]==1&] (* Harvey P. Dale, Jul 09 2018 *)

Crossrefs

Sequence in context: A053662 A050355 A147039 * A136401 A147758 A129787

Adjacent sequences: A069924 A069925 A069926 * A069928 A069929 A069930

Keyword

easy,nonn

Author

Benoit Cloitre, Apr 25 2002

Status

approved