OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
a(n) ~ 24n log n. - Charles R Greathouse IV, Jul 03 2016
MATHEMATICA
Select[Prime[Range[3000]], MemberQ[{1}, Mod[#, 39]]&] (* Vincenzo Librandi, Aug 19 2012 *)
Select[Range[1, 9000, 39], PrimeQ] (* Harvey P. Dale, Dec 21 2014 *)
PROG
(Magma)[p: p in PrimesUpTo(9000) | p mod 39 eq 1 ]; // Vincenzo Librandi, Aug 19 2012
(PARI) is(n)=isprime(n) && n%39==1 \\ Charles R Greathouse IV, Jul 03 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved