A141937 Primes congruent to 13 mod 25.

13, 113, 163, 263, 313, 463, 563, 613, 863, 1013, 1063, 1163, 1213, 1613, 1663, 1913, 2063, 2113, 2213, 2663, 2713, 2963, 3163, 3313, 3413, 3463, 3613, 3863, 4013, 4363, 4463, 4513, 4663, 4813, 5113, 5413, 5563, 5813, 6113, 6163, 6263, 6563, 6763, 6863

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 13 ]; // Vincenzo Librandi, Aug 16 2012

Mathematica

Select[Range[13, 20000, 25], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Jun 15 2011 *)
Select[Prime[Range[1000]],Mod[#,25]==13&] (* Harvey P. Dale, May 30 2021 *)

PARI

is(n)=isprime(n) && n%25==13 \\ Charles R Greathouse IV, Jul 02 2016

Formula

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