OFFSET
1,1
COMMENTS
Different from A088075 though initial three terms match. Sequence is infinite.
REFERENCES
J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 131, p. 45, Ellipses, Paris 2008.
EXAMPLE
a(3) = 131, 130 = 2*5*13 and 132 = 2^2*3*11 both have three prime divisors. 131 is the smallest such prime.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Amarnath Murthy, Sep 22 2003
EXTENSIONS
More terms from Ray Chandler, Oct 08 2003
a(8) and a(9) from Donovan Johnson, Jun 19 2008
a(10)-a(11) from Donovan Johnson, Feb 18 2009
STATUS
approved