OFFSET
1,1
COMMENTS
If a(1) were set to 3, the equivalent sequence would start 3, 9, 17, 38, 71, 146, 279,...
Alternatively starting from a(1)=4 we get 4, 10, 18, 39, 72, 150,..
EXAMPLE
a(2)= 6, the second integer containing an even number of prime factors.
a(3)= 11, the sixth integer containing an odd number of primes.
CROSSREFS
KEYWORD
nonn
AUTHOR
Daniel Tisdale, May 31 2009
EXTENSIONS
Definition clarified, sequence extended beyond 25 by R. J. Mathar, May 31 2010
a(15)-a(31) from Donovan Johnson, Jul 02 2010
STATUS
approved