login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108180 Numbers n such that n^n * (n!/n#) + 1 is prime, where n# = primorial numbers (A034386). 0

%I #3 Dec 15 2017 17:36:48

%S 1,2,8,20,23,55,57,58,181,741,939

%N Numbers n such that n^n * (n!/n#) + 1 is prime, where n# = primorial numbers (A034386).

%C n!/n# is known as n compositorial. All values have been proved prime. No more terms up to 3200.

%K more,nonn

%O 1,2

%A _Jason Earls_, Jul 24 2005

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 22 22:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)