|
| |
|
|
A076680
|
|
Numbers n such that 4*n! + 1 is a prime.
|
|
5
|
|
|
|
0, 1, 4, 7, 8, 9, 13, 16, 28, 54, 86, 129, 190, 351, 466, 697, 938, 1510, 2748, 2878, 3396, 4057, 4384
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,3
|
|
|
LINKS
|
Table of n, a(n) for n=1..23.
Factor Database, Factors of the numbers 4z!+1
|
|
|
EXAMPLE
|
n=7 is here because 4*7!+1=20161 is a prime.
|
|
|
MATHEMATICA
|
Select[Range[5000], PrimeQ[4#!+1]&] (* Harvey P. Dale, Mar 23 2011 *)
|
|
|
CROSSREFS
|
Cf. A051915.
Cf. m*n!-1 is a prime: A076133, A076134, A099350, A099351, A180627-A180631.
Cf. m*n!+1 is a prime: A051915, A076679-A076683, A178488, A180626, A126896.
Cf. n!/m-1 is a prime: A002982, A082671, A139056, A139199-A139205.
Cf. n!/m+1 is a prime: A002981, A082672, A089085, A139061, A139058, A139063, A139065, A151913, A137390, A139071.
Sequence in context: A255060 A047538 A074231 * A235623 A001074 A214206
Adjacent sequences: A076677 A076678 A076679 * A076681 A076682 A076683
|
|
|
KEYWORD
|
nonn,more
|
|
|
AUTHOR
|
Phillip L. Poplin (plpoplin(AT)bellsouth.net), Oct 25 2002
|
|
|
EXTENSIONS
|
Corrected (added missed terms 2748, 2878) by Serge Batalov, Feb 24 2015
|
|
|
STATUS
|
approved
|
| |
|
|
