OFFSET
1,1
COMMENTS
For n=1,2,3,4,5 we have 5 prime numbers, so they are the first terms of the sequence. No other primes has been found for n<101.
EXAMPLE
For n=5 we have the prime p:=12^5-1=15551.
MATHEMATICA
Do[p=2*(n+1)^n-1; If[PrimeQ[p], Print[p]], {n, 100}]
Select[Table[2(n+1)^n-1, {n, 40}], PrimeQ] (* Harvey P. Dale, Dec 02 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Marco Ripà, Mar 11 2011
STATUS
approved