OFFSET
1,1
COMMENTS
This is to semiprimes A001358 as A140768 is to primes A000040. Because Euler's "numerus idoneus" (idoneal, or suitable, or convenient numbers) are finite, this subset is finite. Conjecture: this list is complete (see Weinberger's result and comment by Jud McCranie in A140768).
EXAMPLE
a(16) = A000926(50) = 253 = 11 * 23.
CROSSREFS
KEYWORD
nonn,fini
AUTHOR
Jonathan Vos Post, Jan 29 2011
STATUS
approved