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!)
A125035 Numbers n such that gcd(2^n-69,n)>1. 0
10, 26, 30, 50, 67, 70, 88, 90, 110, 130, 136, 150, 170, 182, 183, 185, 190, 198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Corresponding gcd's are 5,13,5,5,67,5,11,5,5,5,17,5,5,13,61,37,5,11. Cf. A125034, A124977.

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

gcd(2^10-69,10)=gcd(1024-69,10)=gcd(955,10)=5>1. Note that 67|(2^67-69).

MATHEMATICA

Select[Range[7, 100], PrimeQ[2^#-69]&]

CROSSREFS

Cf. A124977, A125034.

Sequence in context: A259297 A046961 A246826 * A067264 A043342 A023715

Adjacent sequences:  A125032 A125033 A125034 * A125036 A125037 A125038

KEYWORD

nonn

AUTHOR

Zak Seidov, Nov 17 2006

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 March 29 15:16 EDT 2020. Contains 333107 sequences. (Running on oeis4.)