

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.
a(7) > 2300.  Giovanni Resta, Aug 28 2015


LINKS

Table of n, a(n) for n=1..6.


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

Cf. A260754.
Sequence in context: A145520 A061412 A165646 * A024635 A217679 A248901
Adjacent sequences: A261636 A261637 A261638 * A261640 A261641 A261642


KEYWORD

nonn,more


AUTHOR

Altug Alkan, Aug 27 2015


STATUS

approved



