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A084403 Primes arising in A084402. a(n) = n-th partial product of A084402 - 1. 0
2, 5, 11, 23, 47, 191, 383, 1151, 6911, 27647, 138239, 691199, 3455999, 34559999, 138239999, 414719999, 2073599999, 16588799999, 364953599999, 4744396799999, 66421555199999, 132843110399999, 664215551999999, 3321077759999999 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

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

PROG

(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

CROSSREFS

Cf. A084402.

Sequence in context: A334276 A055496 A105120 * A261201 A055011 A007505

Adjacent sequences:  A084400 A084401 A084402 * A084404 A084405 A084406

KEYWORD

nonn

AUTHOR

Amarnath Murthy, May 31 2003

EXTENSIONS

More terms from David Wasserman, Dec 22 2004

STATUS

approved

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Last modified December 9 09:37 EST 2021. Contains 349627 sequences. (Running on oeis4.)