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A176540 1 together with the semiprimes. 1
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: A320912 A240938 A001358 * A108764 A193801 A129336

Adjacent sequences:  A176537 A176538 A176539 * A176541 A176542 A176543

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Apr 19 2010

EXTENSIONS

Definition and comment swapped by Michel Marcus, Aug 09 2014

STATUS

approved

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Last modified January 18 05:09 EST 2020. Contains 330995 sequences. (Running on oeis4.)