A142171 Primes congruent to 20 mod 39.

59, 137, 293, 449, 683, 761, 839, 1151, 1229, 1307, 1619, 1697, 1931, 2087, 2243, 2399, 2477, 2633, 2711, 2789, 3023, 3257, 3413, 3491, 3803, 3881, 4271, 4349, 4583, 4817, 4973, 5051, 5441, 5519, 5987, 6143, 6221, 6299, 6689, 7001, 7079, 7547, 7703, 7937

Offset

1,1

Links

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

Formula

a(n) ~ 24n log n. - Charles R Greathouse IV, Jul 03 2016

Mathematica

Select[Prime[Range[3000]], MemberQ[{20}, Mod[#, 39]]&] (* Vincenzo Librandi, Aug 20 2012 *)
Select[Range[20, 8000, 39], PrimeQ] (* Harvey P. Dale, Jun 22 2013 *)

Prog

(Magma)[p: p in PrimesUpTo(9000) | p mod 39 eq 20 ]; // Vincenzo Librandi, Aug 20 2012
(PARI) is(n)=isprime(n) && n%39==20 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A107157 A039537 A220463 * A129480 A044310 A044691

Adjacent sequences: A142168 A142169 A142170 * A142172 A142173 A142174

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved