A176540 - OEIS

A176540

1 together with the semiprimes.

1, 4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 46, 49, 51, 55, 57, 58, 62, 65, 69, 74, 77, 82, 85, 86, 87, 91, 93, 94, 95, 106, 111, 115, 118, 119, 121, 122, 123, 129, 133, 134, 141, 142, 143, 145, 146, 155, 158, 159, 161, 166, 169, 177, 178, 183, 185, 187

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

The products of two noncomposite numbers that do not contain prime numbers.

LINKS

Table of n, a(n) for n=1..62.

MATHEMATICA

Join[{1}, Select[Range[200], PrimeOmega[#]==2&]] (* Harvey P. Dale, Dec 31 2015 *)

CROSSREFS

Cf. A001358, A037143.

Sequence in context: A359765 A240938 A001358 * A108764 A193801 A129336