A141927 Primes congruent to 1 mod 25.

101, 151, 251, 401, 601, 701, 751, 1051, 1151, 1201, 1301, 1451, 1601, 1801, 1901, 1951, 2251, 2351, 2551, 2801, 2851, 3001, 3251, 3301, 3701, 3851, 4001, 4051, 4201, 4451, 4651, 4751, 4801, 4951, 5051, 5101, 5351, 5501, 5651, 5701, 5801, 5851, 6101, 6151

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 1 ]; // Vincenzo Librandi, Aug 16 2012

Mathematica

Select[Prime[Range[900]], MemberQ[{1}, Mod[#, 25]] &] (* Vincenzo Librandi, Aug 16 2012 *)
Select[Range[1,6200,25],PrimeQ] (* Harvey P. Dale, Oct 02 2016 *)

PARI

is(n)=isprime(n) && n%25==1 \\ Charles R Greathouse IV, Jul 02 2016

Formula

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