

A096101


a(1) = 1; for n > 1: a(n) = smallest number >1 such that product of any two or more successive terms  1 is prime.


1




OFFSET

1,2


COMMENTS

Next term > 20000000 if it exists.


LINKS

Table of n, a(n) for n=1..10.


EXAMPLE

a(2) is not 2 since 1*21 = 1 is not prime, but 1*31 = 2 is prime, hence a(2) = 3. a(6) is not 2 since 2*2*2*21 = 15 is not prime, but 2*31 = 5, 2*2*31 = 11, 2*2*2*31 = 23, 3*2*2*2*31 = 71 are all prime, hence a(6) = 3.


CROSSREFS

Cf. A096100.
Sequence in context: A163751 A067279 A106267 * A104890 A064123 A024703
Adjacent sequences: A096098 A096099 A096100 * A096102 A096103 A096104


KEYWORD

more,nonn


AUTHOR

Amarnath Murthy, Jun 24 2004


EXTENSIONS

Edited and extended by Klaus Brockhaus, Jul 05 2004
a(10) from Donovan Johnson, Apr 22 2008


STATUS

approved



