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!)
A118222 Numbers n such that n! * p(n)# + 1 is prime. 1

%I

%S 1,2,3,48,151,312,445

%N Numbers n such that n! * p(n)# + 1 is prime.

%C Seven terms found and primes proved by PrimeForm ([N-1, Brillhart-Lehmer-Selfridge]). There are no more terms <= 2100.

%e 3 is a term as 3! * p(3)# + 1 = 3*2*1 * 5*3*2 + 1 = 181, a prime.

%Y Cf. A118223.

%K nonn

%O 1,2

%A _Rick L. Shepherd_, Apr 15 2006

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 20 05:37 EDT 2021. Contains 347577 sequences. (Running on oeis4.)