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%I #11 Sep 08 2022 08:45:36
%S 229,449,1109,1439,1549,1879,2099,2539,3089,3529,4079,4409,4519,5179,
%T 5399,5839,6389,6719,6829,7159,7489,8039,8369,8699,9029,9689,10459,
%U 10789,11119,11779,12109,12329,12659,13099,13649,13759,14419,14639,14969,15299,15629
%N Primes congruent to 9 mod 55.
%H Vincenzo Librandi, <a href="/A142608/b142608.txt">Table of n, a(n) for n = 1..1000</a>
%F a(n) ~ 40n log n. - _Charles R Greathouse IV_, Jul 04 2016
%t Select[Prime[Range[2500]], MemberQ[{9}, Mod[#, 55]] &] (* _Vincenzo Librandi_, Aug 31 2012 *)
%t Select[Range[9,16000,55],PrimeQ] (* _Harvey P. Dale_, Mar 18 2018 *)
%o (Magma) [p: p in PrimesUpTo(16000) | p mod 55 eq 9]; // _Vincenzo Librandi_, Aug 31 2012
%o (PARI) is(n)=isprime(n) && n%55==9 \\ _Charles R Greathouse IV_, Jul 04 2016
%Y Cf. A000040.
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_, Jul 11 2008