OFFSET
1,1
COMMENTS
No more terms < 2000. - David Wasserman, Mar 27 2008
a(7) >= 4377. A001003(4377) is a 3345-digit composite number with unknown factorization. Other possible terms are 4391, 45207, 45369, 45377, 131723, 131733, ... - Tyler Busby, Feb 08 2023
LINKS
Eric Weisstein's World of Mathematics, Semiprime.
EXAMPLE
CROSSREFS
KEYWORD
nonn,more,less
AUTHOR
Jonathan Vos Post, Dec 09 2004
EXTENSIONS
Edited by Franklin T. Adams-Watters, Nov 07 2006
Changed by Michael Somos, Mar 31 2007, because of the re-indexing of A001003.
a(6) from David Wasserman, Mar 27 2008
STATUS
approved