A142425 Primes congruent to 13 mod 49.

13, 307, 503, 601, 797, 1091, 1483, 1777, 1973, 2267, 2659, 2953, 3541, 4129, 4423, 5011, 5501, 6089, 6481, 6971, 7069, 7559, 7853, 7951, 8147, 8539, 9029, 9127, 9323, 9421, 10009, 10303, 10499, 10597, 10891, 11087, 11969, 12263, 13537, 13831, 14321, 14419

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[{13}, Mod[#, 49]] &] (* Vincenzo Librandi, Aug 28 2012 *)
Select[Range[13, 15000, 49], PrimeQ] (* Harvey P. Dale, Mar 10 2015 *)

Prog

(Magma) [p: p in PrimesUpTo(16000) | p mod 49 eq 13]; // Vincenzo Librandi, Aug 28 2012
(PARI) is(n)=isprime(n) && n%49==13 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A009119 A322734 A331657 * A234236 A183522 A119131

Adjacent sequences: A142422 A142423 A142424 * A142426 A142427 A142428

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved