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Revision History for A137532

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Showing entries 1-10 | older changes

A137532

a(n) is the smallest positive integer k such that d(k) = d(k+n) = 2*n, where d(m) (A000005) is the number of positive divisors of m, or 0 if no such k exists.
(history; published version)

#16 by Joerg Arndt at Sun May 09 04:53:37 EDT 2021

STATUS

reviewed

approved

#15 by Michel Marcus at Sun May 09 03:47:42 EDT 2021

STATUS

proposed

reviewed

#14 by Michel Marcus at Sun May 09 03:47:39 EDT 2021

STATUS

editing

proposed

#13 by Michel Marcus at Sun May 09 03:47:30 EDT 2021

CROSSREFS

Cf. A000005, A139416.

STATUS

reviewed

editing

#12 by Joerg Arndt at Sun May 09 02:55:49 EDT 2021

STATUS

proposed

reviewed

#11 by Jinyuan Wang at Sat May 08 23:46:38 EDT 2021

STATUS

editing

proposed

#10 by Jinyuan Wang at Sat May 08 23:46:00 EDT 2021

	NAME	`a(n) = ) is the smallest positive integer k such that d(k) = d(k+n) = 2n2*n, where d(m) (A000005) is the number of positive divisors of m, or 0 if no such k exists.`
	DATA	`2, 6, 172, 66, 15952, 84, 22592, 888, 2196, 3750, 459932661, 660, 86817796083, 185152, 143366096, 5304, 17685013528576, 3150, 1786574475624429, 1272510, 29059703104, 12872682, 4817557477673402368, 9576, 85608255863, 15744471040, 1179648, 124718750, 1765038427619364800823267`
	COMMENTS	`From Jacques Tramu, Apr 20 2008: (Start)` `a(12) = ???` `a(13) = 5547515219437003248294176693030899` `a(17) = 1477350959671318879923111865392957430890479` `a(19) > 7907^19 if it exists. (End)`
	KEYWORD	`nonn,more` `nonn`
	EXTENSIONS	`More terms from Jinyuan Wang, May 08 2021`
	STATUS	`approved` `editing`

#9 by Joerg Arndt at Sun Mar 18 11:48:19 EDT 2018

STATUS

proposed

approved

#8 by Michel Marcus at Sun Mar 18 11:27:48 EDT 2018

STATUS

editing

proposed

#7 by Michel Marcus at Sun Mar 18 11:27:44 EDT 2018

COMMENTS

Comments from From _Jacques Tramu:_, Apr 20 2008: (Start)

a(19) > 7907^19 if it exists.. (End)

KEYWORD

nonn,more

STATUS

approved

editing

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Last modified August 18 19:26 EDT 2024. Contains 375273 sequences. (Running on oeis4.)