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

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.

Sequence in context: A044675 A112270 A356510 * A136069 A140028 A199818

Adjacent sequences: A124823 A124824 A124825 * A124827 A124828 A124829

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved