OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
a(n) ~ 18n log n. - Charles R Greathouse IV, Jul 02 2016
MATHEMATICA
Select[Prime[Range[2000]], MemberQ[{1}, Mod[#, 19]]&] (* Vincenzo Librandi, Aug 15 2012 *)
PROG
(Magma) [p: p in PrimesUpTo(8000) | p mod 19 eq 1 ]; // Vincenzo Librandi, Aug 15 2012
(PARI) is(n)=isprime(n) && n%19==1 \\ Charles R Greathouse IV, Jul 02 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved