OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
a(n) ~ 22n log n. - Charles R Greathouse IV, Jul 02 2016
MATHEMATICA
Select[Range[21, 20000, 23], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, May 18 2011 *)
PROG
(Magma) [p: p in PrimesUpTo(9000) | p mod 23 eq 21 ]; // Vincenzo Librandi, Aug 16 2012
(PARI) is(n)=isprime(n) && n%23==21 \\ Charles R Greathouse IV, Jul 02 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved