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A016108 Numbers k=3*m+1 such that 2^m == 1 (mod k). 2
1, 31, 43, 109, 127, 157, 223, 229, 277, 283, 307, 397, 433, 439, 457, 499, 601, 643, 691, 727, 733, 739, 811, 919, 997, 1021, 1051, 1069, 1093, 1327, 1399, 1423, 1459, 1471, 1579, 1597, 1627, 1657, 1699, 1723, 1729, 1753, 1777, 1789, 1801, 1831, 1933, 1999, 2017, 2047, 2089, 2113, 2143, 2179, 2203 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Prime terms are listed in A014752.
LINKS
MATHEMATICA
Join[{1}, Select[Table[3m+1, {m, 1000}], PowerMod[2, (#-1)/3, #]==1&]] (* Harvey P. Dale, Apr 26 2016 *)
CROSSREFS
Sequence in context: A347035 A364186 A059898 * A014752 A306787 A227622
KEYWORD
nonn
AUTHOR
Max Alekseyev, Jun 23 2012
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)