The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A139199 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A139199

Numbers k such that (k!-4)/4 is prime.
(history; published version)

#13 by Joerg Arndt at Sun Sep 25 12:33:49 EDT 2016

STATUS

proposed

approved

#12 by Robert Price at Sun Sep 25 12:19:01 EDT 2016

STATUS

editing

proposed

#11 by Robert Price at Sun Sep 25 12:18:46 EDT 2016

COMMENTS

a(2021) > 25000 - Robert Price, Sep 25 2016

#10 by Robert Price at Sun Sep 25 12:18:27 EDT 2016

DATA

4, 5, 6, 7, 8, 10, 15, 18, 23, 157, 165, 183, 184, 362, 611, 908, 2940, 6875, 9446, 16041

COMMENTS

a(20) > 25000 - Robert Price, Sep 25 2016

EXTENSIONS

a(18)-a(20) from Robert Price, Sep 25 2016

STATUS

approved

editing

#9 by Charles R Greathouse IV at Wed Apr 29 16:07:58 EDT 2015

STATUS

editing

approved

#8 by Charles R Greathouse IV at Wed Apr 29 16:07:56 EDT 2015

COMMENTS

a(17) > 2000 [From _- _Ray G. Opao_, Sep 30 2008]

PROG

(PARI) is(n)=n>3 && isprime(n!/4-1) \\ Charles R Greathouse IV, Apr 29 2015

STATUS

approved

editing

#7 by N. J. A. Sloane at Thu Feb 19 00:08:04 EST 2015

STATUS

proposed

approved

#6 by Serge Batalov at Wed Feb 18 21:03:30 EST 2015

STATUS

editing

proposed

#5 by Serge Batalov at Wed Feb 18 21:03:22 EST 2015

DATA

4, 5, 6, 7, 8, 10, 15, 18, 23, 157, 165, 183, 184, 362, 611, 908, 2940

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).

EXTENSIONS

a(17) from Serge Batalov, Feb 18 2015

STATUS

approved

editing

#4 by Russ Cox at Sat Mar 31 10:29:22 EDT 2012

COMMENTS

a(17) > 2000 [From _Ray G. Opao (qzxpqbp(AT)gmail.com), _, Sep 30 2008]

EXTENSIONS

a(15)-a(16) from _Ray G. Opao (qzxpqbp(AT)gmail.com), _, Sep 30 2008

Discussion

Sat Mar 31

10:29

OEIS Server: https://oeis.org/edit/global/599