A142193 Primes congruent to 27 mod 40.

67, 107, 227, 307, 347, 467, 547, 587, 787, 827, 907, 947, 1187, 1307, 1427, 1627, 1667, 1747, 1787, 1867, 1907, 1987, 2027, 2267, 2347, 2467, 2707, 3067, 3187, 3307, 3347, 3467, 3547, 3907, 3947, 4027, 4507, 4547, 4787, 4987, 5107, 5147, 5227, 5347, 5387

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[{27}, Mod[#, 40]]&] (* Vincenzo Librandi, Aug 22 2012 *)
Select[Range[27, 6000, 40], PrimeQ] (* Harvey P. Dale, Mar 16 2018 *)

Prog

(Magma) [p: p in PrimesUpTo(6000) | p mod 40 eq 27 ]; // Vincenzo Librandi, Aug 22 2012
(PARI) is(n)=isprime(n) && n%40==27 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A136077 A180521 A139511 * A141889 A289518 A229058

Adjacent sequences: A142190 A142191 A142192 * A142194 A142195 A142196

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved