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#98 by N. J. A. Sloane at Wed Jul 17 18:58:11 EDT 2024
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#97 by N. J. A. Sloane at Wed Jul 17 18:58:08 EDT 2024
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#96 by Peter Luschny at Tue Dec 13 12:57:52 EST 2022
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#95 by Michel Marcus at Tue Dec 13 10:36:01 EST 2022
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Discussion
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| Tue Dec 13
| 11:08
| Michel Marcus: or should correct comment ?
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| 12:57
| Peter Luschny: That's OK.
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#94 by Michel Marcus at Tue Dec 13 10:35:35 EST 2022
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| COMMENTS
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Or the numbers n such that 13 = number of perfect partitions of n. - Juri-Stepan Gerasimov, Oct 07 2009
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Discussion
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| Tue Dec 13
| 10:36
| Michel Marcus: wrong comment removed; see the 3rd formula for the real thing
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#93 by Michel Marcus at Tue Dec 13 10:33:52 EST 2022
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| EXTENSIONS
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Formula index corrected - R. J. Mathar, Oct 14 2009
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Discussion
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| Tue Dec 13
| 10:34
| Michel Marcus: extension already noted with 3rd formula
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#92 by Michel Marcus at Tue Dec 13 10:32:14 EST 2022
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Discussion
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| Tue Dec 13
| 10:33
| Michel Marcus: moved A162143 to crossrefs
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#91 by Michel Marcus at Tue Dec 13 10:26:38 EST 2022
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#90 by Michel Marcus at Tue Dec 13 10:19:23 EST 2022
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| COMMENTS
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Also the volume of a sphenic brick. A sphenic brick is a rectangular parallelopiped whose sides are components of a sphenic number, namely whose sides are three distinct primes. Example: The distinct prime triple (3,5,7) produces a 3x5x7 unit brick which has volume 105 cubic units. 3-D analog of 2-D A037074 Product of twin primes, per Cino Hilliard's comment. Compare with 3-D A107768 Golden 3-almost primes = Volumes of bricks (rectangular parallelopipeds) each of whose faces has golden semiprime area. - Jonathan Vos Post, Jan 08 2007
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| STATUS
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approved
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#89 by N. J. A. Sloane at Fri Nov 20 17:13:40 EST 2020
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