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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A081765 Numbers n such that (n+2) divides 2^(n-1)-1. 5

%I

%S 1,7,13,19,31,37,49,55,61,67,85,91,109,121,127,139,157,175,181,193,

%T 199,211,217,235,247,265,289,301,307,313,319,325,337,379,391,397,409,

%U 415,445,451,469,487,499,517,535,541,571,577,589,595,631,667,679,685,691

%N Numbers n such that (n+2) divides 2^(n-1)-1.

%C Is a(n)/n/log(n)/log(log(n)) bounded ?

%K easy,nonn

%O 1,2

%A _Benoit Cloitre_, Apr 09 2003

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 November 13 15:39 EST 2019. Contains 329106 sequences. (Running on oeis4.)