A142440 Primes congruent to 31 mod 49.

31, 227, 521, 619, 1109, 1697, 2089, 2383, 2579, 2677, 2971, 3167, 3461, 3559, 3853, 4049, 4441, 4637, 4931, 5323, 5519, 5813, 6793, 7283, 7577, 8263, 8753, 9341, 9439, 9733, 9929, 10223, 10321, 10909, 11399, 11497, 11987, 12281, 12379, 12967, 13163

Offset

1,1

Links

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

Formula

a(n) ~ 42n log n. - Charles R Greathouse IV, Jul 03 2016

Mathematica

Select[Prime[Range[2500]], MemberQ[{31}, Mod[#, 49]] &] (* Vincenzo Librandi, Aug 28 2012 *)
Select[Range[31, 14000, 49], PrimeQ] (* Harvey P. Dale, Aug 03 2024 *)

Prog

(Magma) [p: p in PrimesUpTo(17000) | p mod 49 eq 31]; // Vincenzo Librandi, Aug 28 2012
(PARI) is(n)=isprime(n) && n%49==31 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A229018 A036335 A075931 * A075932 A161747 A059899

Adjacent sequences: A142437 A142438 A142439 * A142441 A142442 A142443

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved