A141942 Primes congruent to 19 mod 25.

19, 269, 419, 569, 619, 719, 769, 919, 1019, 1069, 1319, 1619, 1669, 2069, 2269, 2719, 2819, 2969, 3019, 3119, 3169, 3319, 3469, 3719, 3769, 3919, 4019, 4219, 4519, 4919, 4969, 5119, 5419, 5519, 5569, 5669, 5869, 6269, 6469, 6569, 6619, 6719, 6869, 7019

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.

Programs

Magma

[p: p in PrimesUpTo(8000) | p mod 25 eq 19 ]; // Vincenzo Librandi, Aug 16 2012

Mathematica

Select[Range[19, 20000, 25], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Jun 15 2011 *)
Select[Prime[Range[1000]],Mod[#,25]==19&] (* Harvey P. Dale, Nov 18 2021 *)

PARI

is(n)=isprime(n) && n%25==19 \\ Charles R Greathouse IV, Jul 02 2016

Formula

a(n) ~ 20n log n. - Charles R Greathouse IV, Jul 02 2016