

A193430


Primes p such that p+1 is in A055462.


1




OFFSET

1,1


COMMENTS

Prime numbers that are one less than the product of first n superfactorials.
The next term, if it exists, has more than 75,000 digits.
Subsequence of A238265.


LINKS

Table of n, a(n) for n=1..3.


FORMULA

a(n) are the prime values of 1! * (1! * 2!) * (1! * 2! * 3!) * (1! * 2! * 3! * ... * n!)  1


EXAMPLE

23 is a term because 23 = 1! * (1! * 2!) * (1! * 2! * 3!)  1.


PROG

(PARI) t=1; k=1; for(n=2, 100, t*=n!; k*=t; if(ispseudoprime(k1), print1(k1", "))) \\ Charles R Greathouse IV, Jul 28 2011


CROSSREFS

Cf. A005462, A000040.
Sequence in context: A059932 A045735 A233109 * A233213 A090674 A013728
Adjacent sequences: A193427 A193428 A193429 * A193431 A193432 A193433


KEYWORD

nonn,bref,hard


AUTHOR

Kausthub Gudipati, Jul 28 2011


STATUS

approved



