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#322 by Jianing Song at Mon Aug 26 11:03:00 EDT 2024
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#321 by Jianing Song at Mon Aug 26 11:02:23 EDT 2024
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| COMMENTS
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With regard to the comments by _Ross La Haye _ and _Jianing Song: _: Omitting "proper" gives A000244.
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| STATUS
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approved
editing
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Discussion
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| Mon Aug 26
| 11:03
| Jianing Song: Added _ for users' link.
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#31 by Jianing Song at Mon Aug 26 10:55:22 EDT 2024
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Discussion
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| Mon Aug 26
| 11:04
| Joerg Arndt: I'd be surprised if there is a (substantially) better way.
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#84 by Jianing Song at Mon Aug 26 10:54:32 EDT 2024
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#30 by Jianing Song at Mon Aug 26 10:54:19 EDT 2024
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| PROG
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(PARI) isA066419(n) = (Mod(n!, sumdigits(n!)) != 0) \\ Jianing Song, Aug 26 2024
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Discussion
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| Mon Aug 26
| 10:55
| Jianing Song: Is it possible to have a better program? In the sense that we don't have to calculate n! ?
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#83 by Jianing Song at Mon Aug 26 10:52:22 EDT 2024
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| CROSSREFS
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Cf. A066419 (k such that a(k) does not divide k!).
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| STATUS
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approved
editing
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#29 by Jianing Song at Mon Aug 26 10:52:01 EDT 2024
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| CROSSREFS
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Cf. A004152 (sum of digits of n!).
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| STATUS
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approved
editing
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| A375626
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Irregular table read by rows: row n is the integers of the form d_1 - d_2 + d_3 - d_4 + ... + (-1)^k d_k, where n = d_1 > d_2 > ... > d_k = 1, d_{i+1} divides d_i for 1 <= i <= k-1.
(history;
published version)
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#12 by Jianing Song at Sat Aug 24 22:55:05 EDT 2024
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| A375624
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a(n) is the number of integers of the form d_1 - d_2 + d_3 - d_4 + ... + (-1)^k d_k, where n = d_1 > d_2 > ... > d_k = 1, d_{i+1} divides d_i for 1 <= i <= k-1.
(history;
published version)
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#12 by Jianing Song at Sat Aug 24 22:55:02 EDT 2024
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#11 by Jianing Song at Sat Aug 24 22:54:55 EDT 2024
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| LINKS
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Jianing Song, <a href="/A375624/b375624_1.txt">Table of n, a(n) for n = 1..10000</a>
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| STATUS
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approved
editing
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