A084403 Primes arising in A084402. a(n) = n-th partial product of A084402 - 1.

2, 5, 11, 23, 47, 191, 383, 1151, 6911, 27647, 138239, 691199, 3455999, 34559999, 138239999, 414719999, 2073599999, 16588799999, 364953599999, 4744396799999, 66421555199999, 132843110399999, 664215551999999, 3321077759999999

Offset: 1

Author

Amarnath Murthy, May 31 2003

Keywords

• nonn

Comments

This is a sequence similar to A090552 but here with primes: a(1) = 2; for n>=2, a(n) is the smallest prime p for which p+1 is a multiple of a(n-1) + 1. - J. M. Bergot, Oct 16 2014, revised by Wolfdieter Lang, Nov 24 2014

Examples

			3-1=2, 3*2-1=5, 3*2*2-1=11, etc. are the primes arising in A084402.
		

Crossrefs

Cf. A084402.

Programs

PARI

lista(nn) = {v = vector(nn); for (n=1, nn, v[n] = 2; while (! isprime(p=prod(i=1, n, v[i])-1), v[n]++); print1(p, ", "););} \\ Michel Marcus, Oct 31 2014

Extensions

More terms from David Wasserman, Dec 22 2004