A100367 Even numbers with two prime factors, not counting multiplicity.

6, 10, 12, 14, 18, 20, 22, 24, 26, 28, 34, 36, 38, 40, 44, 46, 48, 50, 52, 54, 56, 58, 62, 68, 72, 74, 76, 80, 82, 86, 88, 92, 94, 96, 98, 100, 104, 106, 108, 112, 116, 118, 122, 124, 134, 136, 142, 144, 146, 148, 152, 158, 160, 162, 164, 166, 172, 176, 178, 184, 188

Offset

1,1

Comments

This is a proper subset of A098902. E.g., 210 is not here, but it is there.

Numbers of the form 2^k*p^h where k > 0, h > 0, and p is an odd prime. [corrected by Lei Zhou, Oct 29 2018]

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[2, 200, 2], PrimeNu@ # == 2 &] (* Michael De Vlieger, Oct 31 2018 *)

Prog

(PARI) isok(n) = !(n%2) && (omega(n) == 2); \\ Michel Marcus, Feb 02 2018

Crossrefs

Cf. A001221.

Intersection of A007774 and A098902.

The even terms of A336101.

A100368 is a subsequence.

Sequence in context: A176587 A174164 A098902 * A213716 A337486 A114989

Adjacent sequences: A100364 A100365 A100366 * A100368 A100369 A100370

Keyword

nonn

Author

Labos Elemer, Nov 22 2004

Status

approved