

A261639


Values of n such that prime(n+1)!/prime(n) + 1 is a prime number.


0




OFFSET

1,1


COMMENTS

a(1) = 2, a(2) = 3, a(3) = 4, a(4) = 5. It can be seen as a nice consecutiveness on sequence for first four items. Another point is that sequence of prime(n+1)! / prime(n) is observed in A260754.


LINKS



EXAMPLE

For n=2 the (prime(n+1)! / prime(n)) + 1 = 41. 41 is prime.


PROG

(PARI) for(n=1, 1e3, if(isprime(k=((prime(n+1)!/prime(n))+1)), print1(n", ")))


CROSSREFS



KEYWORD

nonn,more


AUTHOR



STATUS

approved



