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Revision History for A063740

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Showing entries 1-10 | older changes

A063740

Number of integers k such that cototient(k) = n.
(history; published version)

#25 by Peter Luschny at Sat Apr 08 05:02:36 EDT 2023

STATUS

reviewed

approved

#24 by Joerg Arndt at Sat Apr 08 04:59:01 EDT 2023

STATUS

proposed

reviewed

#23 by Amiram Eldar at Sat Apr 08 04:17:26 EDT 2023

STATUS

editing

proposed

#22 by Amiram Eldar at Sat Apr 08 03:46:39 EDT 2023

FORMULA

From Amiram Eldar, Apr 08 2023 (Start)

a(A005278(n)) = 0.

a(A131825(n)) = 1.

a(A063741(n)) = n. (End)

CROSSREFS

Cf. A005278, A063741, A131825.

STATUS

approved

editing

#21 by Susanna Cuyler at Tue Dec 25 11:35:47 EST 2018

STATUS

reviewed

approved

#20 by Joerg Arndt at Tue Dec 25 11:27:40 EST 2018

STATUS

proposed

reviewed

#19 by Michel Marcus at Tue Dec 25 08:20:28 EST 2018

STATUS

editing

proposed

Discussion
Tue Dec 25	09:24	Jianing Song: Yes

#18 by Michel Marcus at Tue Dec 25 08:20:21 EST 2018

NAME

Number of integers k such that cototient(k) = n.

Discussion
Tue Dec 25	08:20	Michel Marcus: ok ?

#17 by Michel Marcus at Tue Dec 25 08:19:36 EST 2018

CROSSREFS

Cf. A063748 (greatest solution to x-phi(x)=n)).

STATUS

proposed

editing

#16 by Jianing Song at Tue Dec 25 07:47:05 EST 2018

STATUS

editing

proposed

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Last modified July 21 00:10 EDT 2024. Contains 374461 sequences. (Running on oeis4.)