OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
a(n) ~ 40n log n. - Charles R Greathouse IV, Jul 04 2016
MATHEMATICA
Select[Prime[Range[2500]], MemberQ[{4}, Mod[#, 55]] &] (* Vincenzo Librandi, Aug 30 2012 *)
Select[Range[4, 13000, 55], PrimeQ] (* Harvey P. Dale, Nov 22 2016 *)
PROG
(Magma) [p: p in PrimesUpTo(16000) | p mod 55 eq 4]; // Vincenzo Librandi, Aug 30 2012
(PARI) is(n)=isprime(n) && n%55==4 \\ Charles R Greathouse IV, Jul 04 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved