The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A064186 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A064186

Numbers n such that n!+1 and n!-1 have the same number of prime divisors (with repetition).
(history; published version)

#19 by Alois P. Heinz at Fri Jan 03 21:19:19 EST 2020

STATUS

proposed

approved

#18 by Chai Wah Wu at Fri Jan 03 21:17:37 EST 2020

STATUS

editing

proposed

#17 by Chai Wah Wu at Fri Jan 03 21:17:29 EST 2020

COMMENTS

200, 236, 392 and 634 are terms. - Chai Wah Wu, Jan 03 2020

STATUS

approved

editing

#16 by Peter Luschny at Sun Dec 01 07:15:09 EST 2019

STATUS

reviewed

approved

#15 by Joerg Arndt at Sun Dec 01 06:21:08 EST 2019

STATUS

proposed

reviewed

#14 by Amiram Eldar at Sun Dec 01 06:04:16 EST 2019

STATUS

editing

proposed

#13 by Amiram Eldar at Sun Dec 01 05:56:34 EST 2019

CROSSREFS

Cf. A054990, A054991.

#12 by Amiram Eldar at Sun Dec 01 05:54:52 EST 2019

DATA

3, 5, 8, 9, 10, 13, 17, 20, 22, 24, 26, 34, 39, 53, 59, 61, 63, 69, 70, 76, 80, 87, 97, 99, 103, 124, 130

MATHEMATICA

Select[Range[30], PrimeOmega[#! - 1] == PrimeOmega[#! + 1] &] (* Amiram Eldar, Dec 01 2019 *)

EXTENSIONS

a(26)-a(27) from Amiram Eldar, Dec 01 2019

STATUS

approved

editing

#11 by N. J. A. Sloane at Fri Dec 15 17:35:37 EST 2017

AUTHOR

_Jason Earls (zevi_35711(AT)yahoo.com), _, Sep 20 2001

Discussion

Fri Dec 15

17:35

OEIS Server: https://oeis.org/edit/global/2722

#10 by T. D. Noe at Thu Jul 11 21:14:05 EDT 2013

STATUS

proposed

approved