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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

(list; graph; refs; listen; history; text; internal format)

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