Definition:Semiprime Number/Sequence

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Sequence

The sequence of semiprimes begins:

$4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 46, 49, 51, 55, 57, \ldots$

This sequence is A001358 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008).