

A139066


Primes of the form (8+k!)/8.


42



631, 45361, 453601, 59875201, 10897286401, 304112751022080001, 3231502092360622080001, 77556050216654929920001, 1105220249217462744317952000001, 332283946848556096005453226376826986289954816000000001
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

Numbers k for which (8+k!)/8 is prime see A151913
The next term (a(11)) has 174 digits.  Harvey P. Dale, May 10 2016


LINKS

Table of n, a(n) for n=1..10.


MATHEMATICA

a = {}; Do[If[PrimeQ[(n! + 8)/8], AppendTo[a, (n! + 8)/8]], {n, 1, 50}]; a
Select[(8+Range[50]!)/8, PrimeQ] (* Harvey P. Dale, May 10 2016 *)


PROG

(PARI) for(k=4, 1e3, if(ispseudoprime(t=k!/8+1), print1(t", "))) \\ Charles R Greathouse IV, Jul 15 2011


CROSSREFS

Cf. A082672, A089085, A089130, A117141, A007749, A139056, A139057, A139058, A139059, A139060, A139061, A139061, A139062, A139063, A139064, A139065, A139066, A020458.
Sequence in context: A252412 A002227 A251217 * A186898 A006913 A154088
Adjacent sequences: A139063 A139064 A139065 * A139067 A139068 A139069


KEYWORD

nonn


AUTHOR

Artur Jasinski, Apr 07 2008


EXTENSIONS

Corrected link to sequence of indexes.  Serge Batalov, Feb 17 2015
One more term (a(10)) added by Harvey P. Dale, May 10 2016


STATUS

approved



