A124826 - OEIS

A124826

Primes congruent to 1 mod 21.

43, 127, 211, 337, 379, 421, 463, 547, 631, 673, 757, 883, 967, 1009, 1051, 1093, 1303, 1429, 1471, 1597, 1723, 1933, 2017, 2143, 2269, 2311, 2437, 2521, 2647, 2689, 2731, 2857, 3067, 3109, 3319, 3361, 3529, 3571, 3613, 3697, 3739, 3823, 3907, 4159, 4201

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

OFFSET

1,1

LINKS

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

MATHEMATICA

Select[Range[1, 5000, 21], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Apr 03 2011*)

PROG

(Magma) [p: p in PrimesUpTo(5000) | p mod 21 eq 1 ]; // Vincenzo Librandi, Aug 14 2012

(PARI) is(n)=isprime(n) && n%21==1 \\ Charles R Greathouse IV, Jul 01 2016

CROSSREFS

Cf. A000040, A141881.