A141943 Primes congruent to 21 mod 25.

71, 271, 421, 521, 571, 821, 971, 1021, 1171, 1321, 1471, 1571, 1621, 1721, 1871, 2221, 2371, 2521, 2621, 2671, 2971, 3121, 3221, 3271, 3371, 3571, 3671, 3821, 4021, 4271, 4421, 4621, 4721, 4871, 5021, 5171, 5471, 5521, 5821, 6121, 6221, 6271, 6421, 6521

Offset

1,1

Links

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

Formula

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

Mathematica

Select[Range[21, 20000, 25], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Jun 15 2011 *)

Prog

(Magma) [p: p in PrimesUpTo(8000) | p mod 25 eq 21 ]; // Vincenzo Librandi, Aug 16 2012
(PARI) is(n)=isprime(n) && n%25==21 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A033240 A298103 A293395 * A167441 A349084 A140856

Adjacent sequences: A141940 A141941 A141942 * A141944 A141945 A141946

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved