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A142371
Primes congruent to 20 mod 47.
1
67, 349, 443, 631, 1289, 1571, 1759, 2417, 2699, 2887, 3169, 3733, 4297, 4391, 4673, 4861, 5237, 5519, 5801, 6271, 6553, 7211, 7681, 7963, 8527, 9091, 9467, 9749, 10313, 10501, 11159, 12569, 12757, 13697, 14449, 14543, 14731, 15013, 15107, 15671, 15859
OFFSET
1,1
LINKS
FORMULA
a(n) ~ 46n log n. - Charles R Greathouse IV, Jul 03 2016
MATHEMATICA
Select[Prime[Range[2500]], MemberQ[{20}, Mod[#, 47]]&] (* Vincenzo Librandi, Aug 27 2012 *)
Select[Range[20, 16000, 47], PrimeQ] (* Harvey P. Dale, Jun 01 2018 *)
PROG
(Magma) [p: p in PrimesUpTo(18000) | p mod 47 eq 20]; // Vincenzo Librandi, Aug 27 2012
(PARI) is(n)=isprime(n) && n%47==20 \\ Charles R Greathouse IV, Jul 03 2016
CROSSREFS
Cf. A000040.
Sequence in context: A013533 A012865 A026911 * A142609 A262344 A323577
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved