A142183 Primes congruent to 1 mod 40.

41, 241, 281, 401, 521, 601, 641, 761, 881, 1201, 1321, 1361, 1481, 1601, 1721, 1801, 2081, 2161, 2281, 2441, 2521, 2801, 3001, 3041, 3121, 3361, 3761, 3881, 4001, 4201, 4241, 4441, 4481, 4561, 4721, 4801, 5081, 5281, 5441, 5521, 5641, 5801, 5881, 6121

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[{1}, Mod[#, 40]]&] (* Vincenzo Librandi, Aug 20 2012 *)
Select[Range[1, 7000, 40], PrimeQ] (* Harvey P. Dale, Dec 07 2015 *)

Prog

(Magma)[p: p in PrimesUpTo(7000) | p mod 40 eq 1]; // Vincenzo Librandi, Aug 20 2012
(PARI) is(n)=isprime(n) && n%40==1 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A326228 A142392 A142943 * A201786 A167443 A098675

Adjacent sequences: A142180 A142181 A142182 * A142184 A142185 A142186

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved