A142188 - OEIS

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A142188

Primes congruent to 13 mod 40.

13, 53, 173, 293, 373, 613, 653, 733, 773, 853, 1013, 1093, 1213, 1373, 1453, 1493, 1613, 1693, 1733, 1933, 1973, 2053, 2213, 2293, 2333, 2693, 3253, 3373, 3413, 3533, 3613, 3733, 3853, 4013, 4093, 4133, 4253, 4373, 4493, 4733, 4813, 4933, 4973, 5333, 5413

(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) ~ 16n log n. - Charles R Greathouse IV, Jul 03 2016

MATHEMATICA

Select[Prime[Range[2000]], MemberQ[{13}, Mod[#, 40]]&] (* Vincenzo Librandi, Aug 20 2012 *)

PROG

(Magma) [p: p in PrimesUpTo(7000) | p mod 40 eq 13]; // Vincenzo Librandi, Aug 20 2012

(PARI) is(n)=isprime(n) && n%40==13 \\ Charles R Greathouse IV, Jul 03 2016