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A142421 Primes congruent to 9 mod 49. 1
107, 401, 499, 1087, 1283, 1381, 1871, 2459, 2557, 2753, 2851, 3733, 3929, 4027, 4517, 4909, 5399, 5693, 5791, 5987, 6379, 6673, 6869, 6967, 7457, 8731, 9221, 9319, 9613, 9907, 10103, 10691, 10789, 11083, 11279, 11867, 12161, 12553, 13043, 13337, 13729 (list; graph; refs; listen; history; text; internal format)
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[1700]], Mod[#, 49]==9&]  (* Harvey P. Dale, Apr 20 2011 *)

Select[Prime[Range[2500]], MemberQ[{9}, Mod[#, 49]] &] (* Vincenzo Librandi, Aug 27 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(16000) | p mod 49 eq 9]; // Vincenzo Librandi, Aug 27 2012

(PARI) is(n)=isprime(n) && n%49==9 \\ Charles R Greathouse IV, Jul 03 2016

CROSSREFS

Cf. A000040.

Sequence in context: A106948 A139989 A059699 * A183847 A142696 A142775

Adjacent sequences:  A142418 A142419 A142420 * A142422 A142423 A142424

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jul 11 2008

STATUS

approved

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Last modified May 25 19:30 EDT 2020. Contains 334595 sequences. (Running on oeis4.)