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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A288715 Primes of the form k!8+1, where k!8 is the octuple factorial number (A114800). 1
2, 3, 5, 7, 26881, 55441, 96909121, 132843110401, 48704929136641, 152349556104345601, 1397121162877440001, 383414179456168545484801, 81419177249980419349301811609600001, 13189906714496827934586893480755200001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..21

Henri& Renaud Lifchitz, PRP Records.Search for n!8+1.

Joe McLean, Interesting Sources of Probable Primes

OpenPFGW Project, Primality Tester

MATHEMATICA

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];

Select[Table[MultiFactorial[i, 8] + 1, {i, 0, 100}], PrimeQ[#]&]

CROSSREFS

Cf. A204661.

Sequence in context: A252357 A037948 A007659 * A208361 A145380 A136740

Adjacent sequences:  A288712 A288713 A288714 * A288716 A288717 A288718

KEYWORD

nonn

AUTHOR

Robert Price, Jun 13 2017

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 December 7 20:40 EST 2021. Contains 349589 sequences. (Running on oeis4.)