OFFSET
1,1
COMMENTS
Primes congruent to 7 mod 90. - Vladimir Joseph Stephan Orlovsky, Jul 14 2011.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
a(n) ~ 24n log n. - Charles R Greathouse IV, Jul 02 2016
MATHEMATICA
Select[Range[7, 30000, 90], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Jul 14 2011 *)
Select[Prime[Range[3000]], MemberQ[{7}, Mod[#, 45]]&] (* Vincenzo Librandi, Aug 25 2012 *)
PROG
(Magma) [p: p in PrimesUpTo(10000) | p mod 45 eq 7]; // Vincenzo Librandi, Aug 25 2012
(PARI) is(n)=isprime(n) && n%45==7 \\ Charles R Greathouse IV, Jul 02 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved