A345382 Numbers with exactly 3 semiprime divisors.

30, 36, 42, 66, 70, 72, 78, 100, 102, 105, 108, 110, 114, 130, 138, 144, 154, 165, 170, 174, 182, 186, 190, 195, 196, 200, 216, 222, 225, 230, 231, 238, 246, 255, 258, 266, 273, 282, 285, 286, 288, 290, 310, 318, 322, 324, 345, 354, 357, 366, 370, 374, 385, 392, 399, 400

Offset: 1

Author

Wesley Ivan Hurt, Jun 16 2021

Keywords

• nonn

Comments

Numbers of the form p*q*r or p^j*q^k, where p,q,r are prime and j,k >= 2. - Wesley Ivan Hurt, Oct 01 2021

Examples

			42 is in the sequence since it has exactly 3 semiprime divisors: 6, 14 and 21.
		

Crossrefs

Cf. A001358 (semiprimes).