A142466 Primes congruent to 27 mod 50.

127, 227, 277, 577, 677, 727, 827, 877, 977, 1277, 1327, 1427, 1627, 1777, 1877, 2027, 2377, 2477, 2677, 2777, 2927, 3527, 3677, 3727, 3877, 4027, 4127, 4177, 4327, 4877, 5077, 5227, 5477, 5527, 5827, 5927, 6277, 6427, 6577, 6827, 6977, 7027, 7127, 7177

Offset: 1

Author

N. J. A. Sloane, Jul 11 2008

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A000040, A141928.

Programs

Magma

[p: p in PrimesUpTo(8000) | p mod 50 eq 27]; // Vincenzo Librandi, Aug 28 2012

Mathematica

Select[Prime[Range[1000]], MemberQ[{27}, Mod[#, 50]] &] (* Vincenzo Librandi, Aug 28 2012 *)
Select[Range[27,7200,50],PrimeQ] (* Harvey P. Dale, Apr 08 2018 *)

PARI

is(n)=isprime(n) && n%50==27 \\ Charles R Greathouse IV, Jul 03 2016

Formula

a(n) ~ 20n log n. - Charles R Greathouse IV, Jul 03 2016