login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A215610 Odd integers n such that 2^n == 2^6 (mod n). 11
1, 31, 18631, 55831, 92329, 3014633, 3556559, 6429121, 9664591, 12158831, 33554431, 34844431, 566740481, 644903881, 727815241, 842608801, 2207017049, 2208171881, 2445644207, 8694918511, 9031128791, 18738146881, 27345981361, 35476604081 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Also, the odd solutions to 2^(n-6) == 1 (mod n). The only even solution is n=6.

For all m, 2^A033981(m)-1 belongs to this sequence.

LINKS

Max Alekseyev, Table of n, a(n) for n = 1..102 (all terms below 10^14)

MATHEMATICA

m = 64; Join[Select[Range[1, m, 2], Divisible[2^# - m, #] &],

Select[Range[m + 1, 10^6, 2], PowerMod[2, #, #] == m &]] (* Robert Price, Oct 08 2018 *)

CROSSREFS

The odd terms of A015926.

Cf. A173572, A033984, A215611, A215612, A215613

Sequence in context: A245571 A074218 A161395 * A292009 A086122 A239167

Adjacent sequences:  A215607 A215608 A215609 * A215611 A215612 A215613

KEYWORD

nonn

AUTHOR

Max Alekseyev, Aug 17 2012

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 September 16 07:19 EDT 2021. Contains 347469 sequences. (Running on oeis4.)