A141894 Primes congruent to 13 mod 21.

13, 97, 139, 181, 223, 307, 349, 433, 601, 643, 727, 769, 811, 853, 937, 1021, 1063, 1231, 1399, 1483, 1567, 1609, 1693, 1777, 1861, 1987, 2029, 2113, 2239, 2281, 2617, 2659, 2953, 3037, 3079, 3121, 3163, 3331, 3373, 3457, 3499, 3541, 3583, 3709, 3793, 3877

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 01 2016

Mathematica

Select[Range[13, 5000, 21], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Apr 04 2011 *)

Prog

(Magma) [ p: p in PrimesUpTo(5000) | p mod 21 eq 13 ]; // Vincenzo Librandi, Apr 05 2011
(PARI) is(n)=isprime(n) && n%21==13 \\ Charles R Greathouse IV, Jul 01 2016

Crossrefs

Cf. A000040, A124826.

Sequence in context: A297603 A094499 A242385 * A275879 A160554 A211388

Adjacent sequences: A141891 A141892 A141893 * A141895 A141896 A141897

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved