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A142186 Primes congruent to 9 mod 40. 1
89, 409, 449, 569, 769, 809, 929, 1009, 1049, 1129, 1249, 1289, 1409, 1489, 1609, 1889, 2089, 2129, 2609, 2689, 2729, 2969, 3049, 3089, 3169, 3209, 3329, 3449, 3529, 3769, 3889, 3929, 4049, 4129, 4289, 4409, 4649, 4729, 4889, 4969, 5009, 5209, 5449, 5569 (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[{9}, Mod[#, 40]]&] (* Vincenzo Librandi, Aug 20 2012 *)

PROG

(MAGMA)[p: p in PrimesUpTo(7000) | p mod 40 eq 9]; // Vincenzo Librandi, Aug 20 2012

(PARI) is(n)=isprime(n) && n%40==9 \\ Charles R Greathouse IV, Jul 03 2016

CROSSREFS

Cf. A000040.

Sequence in context: A061372 A254754 A083473 * A142757 A051416 A279366

Adjacent sequences:  A142183 A142184 A142185 * A142187 A142188 A142189

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jul 11 2008

STATUS

approved

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Last modified January 20 04:42 EST 2019. Contains 319323 sequences. (Running on oeis4.)