OFFSET

1,2

LINKS

Ray Chandler, Table of n, a(n) for n = 1..4096 (computed from A137795 b-file)

FORMULA

EXAMPLE

20 is factored as 2^2 *5^1. Checking the integers >= 20: 20*20 is not factorable into consecutive primes, since 3 is missing. 21 is factored as 3^1 *7^1. Since the distinct primes that divide 20 and 21 (which are 2,3,5,7) form a set of consecutive primes, then a(20) = 21.

CROSSREFS

KEYWORD

nonn

AUTHOR

Leroy Quet, Aug 03 2008

EXTENSIONS

Inserted a(15) and a(21) and extended by R. J. Mathar, Aug 14 2008

a(46)-a(61) from Ray Chandler, Nov 09 2008

STATUS

approved