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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

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Last modified June 24 15:07 EDT 2017. Contains 288697 sequences.