The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A082672 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A082672

Numbers n such that (n! + 2)/2 is a prime.
(history; published version)

#27 by Charles R Greathouse IV at Thu Sep 08 08:45:10 EDT 2022

PROG

(MAGMAMagma) [ n: n in [1..300] | IsPrime((Factorial(n)+2) div 2) ];

Discussion

Thu Sep 08

08:45

OEIS Server: https://oeis.org/edit/global/2944

#26 by N. J. A. Sloane at Thu Oct 19 10:38:26 EDT 2017

EXTENSIONS

More terms from _Don Reble, _, Dec 08 2003

Discussion

Thu Oct 19

10:38

OEIS Server: https://oeis.org/edit/global/2704

#25 by Joerg Arndt at Fri Feb 20 13:57:01 EST 2015

STATUS

proposed

approved

#24 by Serge Batalov at Fri Feb 20 13:55:00 EST 2015

STATUS

editing

proposed

Discussion

Fri Feb 20

13:56

Joerg Arndt: OK, will "revert" now.

#23 by Serge Batalov at Fri Feb 20 13:54:00 EST 2015

DATA

2, 4, 5, 7, 8, 13, 16, 30, 43, 49, 91, 119, 213, 1380, 1637, 2258, 4647, 9701, 12258, 46127

EXTENSIONS

a(20) from Serge Batalov, Feb 20 2015

STATUS

proposed

editing

Discussion

Fri Feb 20

13:54

Serge Batalov: Sorry, wrong sequence extended. The element is for 2*n!+1, not for n!/2+1...
Reverted.

#22 by Serge Batalov at Fri Feb 20 11:08:28 EST 2015

STATUS

editing

proposed

#21 by Serge Batalov at Fri Feb 20 11:08:15 EST 2015

DATA

2, 4, 5, 7, 8, 13, 16, 30, 43, 49, 91, 119, 213, 1380, 1637, 2258, 4647, 9701, 12258, 46127

EXTENSIONS

a(20) from Serge Batalov, Feb 20 2015

STATUS

approved

editing

#20 by N. J. A. Sloane at Thu Feb 19 00:06:43 EST 2015

STATUS

proposed

approved

#19 by Serge Batalov at Wed Feb 18 21:09:48 EST 2015

STATUS

editing

proposed

#18 by Serge Batalov at Wed Feb 18 21:09:43 EST 2015

CROSSREFS

Cf. n!/m-1 is a prime: A002982, A082671, A139056, A139199-A139205; n!/m+1 is a prime: A002981, A082672, A089085, A139061, A139058, A139063, A139065, A151913, A137390, A139071 (1<=m<=10).

STATUS

approved

editing