A115719 Products of two primes that are not Chen primes.

1849, 2623, 3139, 3397, 3721, 4171, 4429, 4453, 4819, 5329, 5767, 5917, 6241, 6283, 6493, 7009, 7081, 7439, 7519, 7663, 8137, 8299, 9211, 9409, 9589, 9847, 9943, 9991, 10363, 10553, 10609, 11023, 11653, 11773, 11899, 11911, 11929, 12169, 12629, 12877

Offset: 1

Author

Jonathan Vos Post, Mar 09 2006

Keywords

• easy
• nonn

Comments

Subset of semiprimes (A001358) such that neither prime factor is a Chen prime (A109611).

Examples

			a(1) = 1849 = A102540(1)*A102540(1) = 43*43.
a(2) = 2623 = A102540(1)*A102540(2) = 43*61.
a(36) = 14701 = A102540(2)*A102540(13) = 61 * 241.
		

Crossrefs

Cf. A001358, A109611, A102540.