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A142025 Primes congruent to 21 mod 31. 1
83, 269, 331, 641, 827, 1013, 1447, 1571, 2129, 2377, 2687, 2749, 3121, 3307, 3617, 3803, 3989, 4051, 4423, 4547, 4733, 4919, 5167, 5477, 5849, 6221, 6469, 6779, 6841, 7027, 7151, 7213, 7523, 8081, 8329, 8887, 9011, 9631, 9817, 9941, 10313, 10499, 11057, 11119 (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) ~ 30n log n. - Charles R Greathouse IV, Jul 03 2016

MATHEMATICA

Select[Range[21, 20000, 31], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Apr 30 2011 *)

PROG

(MAGMA) [p: p in PrimesUpTo(12000) | p mod 31 eq 21 ]; // Vincenzo Librandi, Aug 17 2012

(PARI) is(n)=isprime(n) && n%31==21 \\ Charles R Greathouse IV, Jul 03 2016

CROSSREFS

Cf. A000040, A142005, A142006, A142023.

Sequence in context: A008897 A159071 A023284 * A142387 A145651 A244776

Adjacent sequences:  A142022 A142023 A142024 * A142026 A142027 A142028

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jul 11 2008

STATUS

approved

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Last modified September 19 07:24 EDT 2020. Contains 337178 sequences. (Running on oeis4.)