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#60 by Joerg Arndt at Sat Aug 17 01:34:25 EDT 2024
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#59 by Michel Marcus at Sat Aug 17 01:16:11 EDT 2024
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#58 by Chai Wah Wu at Sat Aug 17 00:35:31 EDT 2024
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#57 by Chai Wah Wu at Sat Aug 17 00:33:06 EDT 2024
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#56 by Chai Wah Wu at Sat Aug 17 00:32:51 EDT 2024
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#55 by N. J. A. Sloane at Sat Nov 20 20:57:22 EST 2021
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#54 by N. J. A. Sloane at Sat Nov 20 20:56:08 EST 2021
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Numbers that are products of 4 primes (these numbers are sometimes called "4-almost primes", a generalization of semiprimes).
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| COMMENTS
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Also called "quadruprimes". Divisible by exactly 4 prime powers (not including 1).
Maybe "4-composite numbers" would be a more suitable name? - M. F. Hasler, Nov 13 2021
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| STATUS
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proposed
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Discussion
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| Sat Nov 20
| 20:57
| N. J. A. Sloane: "Semiprime" is already a horrible name. Let's not generalize it.
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#53 by Michael S. Branicky at Fri Nov 19 15:41:29 EST 2021
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Discussion
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| Fri Nov 19
| 15:43
| Alois P. Heinz: ... interfering edits ...
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| 17:34
| M. F. Hasler: Now, should I delete my comment? It was actually following someones comment critisizing when *I* used "4-almost primes" referring to this sequence...
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#52 by Michael S. Branicky at Fri Nov 19 15:41:27 EST 2021
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#51 by Alois P. Heinz at Fri Nov 19 15:35:03 EST 2021
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Discussion
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| Fri Nov 19
| 15:39
| M. F. Hasler: Yes, that's the Conway paper i referred to. Where they say they invent this terminology. Which isn't used in any other published paper, afaics.
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| 15:41
| Alois P. Heinz: ok, correct. But quadruprime is easy to understand ...
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