A329481 Numbers which are not the sum of two squarefree semiprimes.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 17, 18, 19, 22, 23, 26, 33, 34, 38, 46, 51, 58, 62, 82

Offset: 1

Author

Lior Manor, Nov 14 2019

Keywords

• nonn

Comments

Is this a finite sequence?

Most probably yes. Since almost all semiprimes are squarefree, this is essentially the same as A072966. The graph of A072931 would not change qualitatively if only squarefree semiprimes were considered. - M. F. Hasler, Dec 03 2019

Examples

			a(10) = 11 since there is no way to represent 11 as a sum of two squarefree semiprimes. 12 is not a term since 12 = 6 + 6.
		

Crossrefs

Cf. A006881, A072966.