OFFSET
1,1
LINKS
Enrique PĂ©rez Herrero, Table of n, a(n) for n = 1..2500
FORMULA
a(n) ~ 18n log n. - Charles R Greathouse IV, Jul 02 2016
MATHEMATICA
isA142152[n_]:=(Mod[n, 38]==21)&&(PrimeQ[n])
Select[Prime[Range[1000]], Mod[#, 38]==21&]
Select[Range[21, 6000, 38], PrimeQ] (* Harvey P. Dale, Nov 06 2019 *)
PROG
(Magma)[p: p in PrimesUpTo(7000) | p mod 38 eq 21 ]; // Vincenzo Librandi, Aug 19 2012
(PARI) is(n)=isprime(n) && n%38==21 \\ Charles R Greathouse IV, Jul 02 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved