login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A076683 Numbers k such that 7*k! + 1 is prime. 9
3, 7, 8, 15, 19, 29, 36, 43, 51, 158, 160, 203, 432, 909, 1235, 3209 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(17) > 5830. - Jinyuan Wang, Feb 05 2020

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

k = 3 is here because 7*3! + 1 = 43 is prime.

PROG

(PARI) is(k) = ispseudoprime(7*k!+1); \\ Jinyuan Wang, Feb 05 2020

CROSSREFS

Cf. A002981, A051915, A076679, A076680, A076681, A076682, A178488, A180626, A126896.

Sequence in context: A051211 A105173 A309197 * A045542 A249435 A192120

Adjacent sequences:  A076680 A076681 A076682 * A076684 A076685 A076686

KEYWORD

nonn,more

AUTHOR

Phillip L. Poplin (plpoplin(AT)bellsouth.net), Oct 25 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 7 13:36 EDT 2020. Contains 333305 sequences. (Running on oeis4.)