A142185 Primes congruent to 7 mod 40.

7, 47, 127, 167, 367, 487, 607, 647, 727, 887, 967, 1087, 1327, 1367, 1447, 1487, 1567, 1607, 1847, 2087, 2207, 2287, 2447, 2647, 2687, 2767, 2887, 2927, 3167, 3407, 3527, 3607, 3727, 3767, 3847, 3967, 4007, 4127, 4327, 4447, 4567, 4967, 5087, 5167, 5407

Offset

1,1

Links

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

Formula

a(n) ~ 16n log n. - Charles R Greathouse IV, Jul 03 2016

Mathematica

Select[Prime[Range[2000]], MemberQ[{7}, Mod[#, 40]]&] (* Vincenzo Librandi, Aug 20 2012 *)

Prog

(Magma) [p: p in PrimesUpTo(7000) | p mod 40 eq 7]; // Vincenzo Librandi, Aug 20 2012
(PARI) is(n)=isprime(n) && n%40==7 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A009219 A348394 A158713 * A158914 A046872 A167860

Adjacent sequences: A142182 A142183 A142184 * A142186 A142187 A142188

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved