A142431 Primes congruent to 20 mod 49.

167, 461, 853, 1049, 1637, 1931, 2029, 2617, 3499, 3793, 3989, 4283, 4871, 4969, 5557, 5851, 6047, 6733, 7027, 7321, 7517, 8693, 9281, 9967, 10163, 10457, 11437, 11633, 11731, 11927, 12613, 12809, 12907, 13103, 13397, 13691, 13789, 14083, 14867, 15161, 15259

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[{20}, Mod[#, 49]] &] (* Vincenzo Librandi, Aug 28 2012 *)
Select[Range[20, 16000, 49], PrimeQ] (* Harvey P. Dale, Feb 01 2015 *)

Prog

(Magma) [p: p in PrimesUpTo(17000) | p mod 49 eq 20]; // Vincenzo Librandi, Aug 28 2012 *)
(PARI) is(n)=isprime(n) && n%49==20 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A009840 A033255 A052233 * A142776 A362542 A158218

Adjacent sequences: A142428 A142429 A142430 * A142432 A142433 A142434

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved