OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
a(n) ~ 42n log n. - Charles R Greathouse IV, Jul 02 2016
MATHEMATICA
Select[Prime[Range[2500]], MemberQ[{23}, Mod[#, 49]] &] (* Vincenzo Librandi, Aug 28 2012 *)
Select[Range[23, 16000, 49], PrimeQ] (* Harvey P. Dale, Sep 13 2018 *)
PROG
(Magma) [p: p in PrimesUpTo(17000) | p mod 49 eq 23]; // Vincenzo Librandi; Aug 28 2012
(PARI) is(n)=isprime(n) && n%49==23 \\ Charles R Greathouse IV, Jul 02 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved