OFFSET
1,1
COMMENTS
Conjecture: Primes p such that ((x+1)^7-1)/x has 3 irreducible factors of degree 2 over GF(p). - Federico Provvedi, Mar 31 2018
Also primes of the form 14*k + 13. - David A. Corneth, Apr 02 2018
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MAPLE
select(n->isprime(n) and modp(n, 7)=6, [$1..1900]); # Muniru A Asiru, Mar 31 2018
MATHEMATICA
Select[Range[6, 1600, 7], PrimeQ] (* Bruno Berselli, Aug 17 2012 *)
PROG
(Magma) [ p: p in PrimesUpTo(11000) | p mod 7 eq 6 ]; // Vincenzo Librandi, Aug 13 2012
(PARI) is(n)=isprime(n) && n%7==6 \\ Charles R Greathouse IV, Jul 01 2016
(GAP) Filtered([1..1900], n->IsPrime(n) and n mod 7 = 6); # Muniru A Asiru, Mar 31 2018
CROSSREFS
Cf. A042988 (complement).
KEYWORD
nonn,easy
AUTHOR
STATUS
approved