login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A015931 Positive integers n such that 2^n (mod n) == 2^9 (mod n). 8
1, 2, 3, 4, 5, 8, 9, 16, 17, 21, 27, 32, 45, 63, 64, 99, 105, 117, 124, 128, 153, 171, 189, 207, 254, 256, 261, 273, 279, 333, 369, 387, 423, 429, 477, 512, 513, 531, 549, 585, 603, 639, 657, 711, 747, 801, 873, 909, 927, 945, 963, 981, 1017, 1143, 1179, 1197, 1209, 1233, 1251, 1341, 1359, 1365, 1413, 1467, 1472, 1503, 1504, 1557, 1611, 1629, 1665, 1719, 1737, 1773, 1785, 1791, 1899, 1971 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For all m, 2^A128123(m)-1 belongs to this sequence.

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..10000

OEIS Wiki, 2^n mod n

MATHEMATICA

Select[Range[2000], PowerMod[2, 9, #]==PowerMod[2, #, #]&] (* Harvey P. Dale, Apr 01 2017 *)

PROG

(PARI) isok(n) = Mod(2, n)^n == 2^9; \\ Michel Marcus, Sep 23 2016

CROSSREFS

Contains A208157 as a subsequence.

The odd terms form A276970.

Sequence in context: A264886 A287117 A286431 * A306044 A263581 A120430

Adjacent sequences:  A015928 A015929 A015930 * A015932 A015933 A015934

KEYWORD

nonn

AUTHOR

Robert G. Wilson v

EXTENSIONS

Edited by Max Alekseyev, Jul 30 2011

Definition clarified by Harvey P. Dale, Apr 01 2017

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 14 14:50 EST 2019. Contains 329979 sequences. (Running on oeis4.)