A142025 Primes congruent to 21 mod 31.

83, 269, 331, 641, 827, 1013, 1447, 1571, 2129, 2377, 2687, 2749, 3121, 3307, 3617, 3803, 3989, 4051, 4423, 4547, 4733, 4919, 5167, 5477, 5849, 6221, 6469, 6779, 6841, 7027, 7151, 7213, 7523, 8081, 8329, 8887, 9011, 9631, 9817, 9941, 10313, 10499, 11057, 11119

Offset

1,1

Links

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

Formula

a(n) ~ 30n log n. - Charles R Greathouse IV, Jul 03 2016

Mathematica

Select[Range[21, 20000, 31], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Apr 30 2011 *)
Select[Prime[Range[1500]], Mod[#, 31]==21&] (* Harvey P. Dale, Aug 20 2024 *)

Prog

(Magma) [p: p in PrimesUpTo(12000) | p mod 31 eq 21 ]; // Vincenzo Librandi, Aug 17 2012
(PARI) is(n)=isprime(n) && n%31==21 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040, A142005, A142006, A142023.

Sequence in context: A008897 A159071 A023284 * A142387 A145651 A244776

Adjacent sequences: A142022 A142023 A142024 * A142026 A142027 A142028

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved