A141888 Primes congruent to 2 mod 21.

2, 23, 107, 149, 191, 233, 317, 359, 401, 443, 569, 653, 821, 863, 947, 1031, 1283, 1367, 1409, 1451, 1493, 1619, 1787, 1871, 1913, 1997, 2039, 2081, 2207, 2333, 2417, 2459, 2543, 2711, 2753, 2837, 2879, 2963, 3089, 3257, 3299, 3467, 3593, 3677, 3719, 3761

Offset

1,1

Links

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

Formula

a(n) ~ 12n log n. - Charles R Greathouse IV, Jul 02 2016

Mathematica

Select[Prime[Range[600]], Mod[#, 21] == 2&] (* Harvey P. Dale, Jan 04 2011 *)

Prog

(Magma) [p: p in PrimesUpTo(4000) | p mod 21 eq 2 ]; // Vincenzo Librandi, Aug 16 2012
(PARI) is(n)=isprime(n) && n%21==2 \\ Charles R Greathouse IV, Jul 02 2016

Crossrefs

Cf. A000040.

Sequence in context: A068876 A073175 A352164 * A285811 A201851 A034523

Adjacent sequences: A141885 A141886 A141887 * A141889 A141890 A141891

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved