A250289 Numbers n such that the numerator of Bernoulli(n) (A027641(n)) is a semiprime.

20, 24, 26, 34, 38, 40, 64, 72, 74, 114, 118, 144, 192

Offset: 1

Author

Eric Chen, Dec 24 2014

Keywords

• nonn

Examples

			a(1) = 20 so the numerator of Bernoulli(20) = 174611 = 283 * 617 is a semiprime.
		

Links

• Hisanori Mishima, Factorizations of many number sequences
• Hisanori Mishima, Factorizations of many number sequences
• Factorization of Bernoulli and Euler numbers

Crossrefs

Cf. A092132.