A142024 Primes congruent to 20 mod 31.

113, 547, 733, 857, 919, 1229, 1291, 1601, 1663, 1787, 1973, 2221, 2531, 2593, 2903, 3089, 3461, 3709, 3833, 4019, 4391, 4639, 5011, 5197, 5507, 5569, 5693, 5879, 6871, 7057, 7243, 8111, 8297, 8669, 8731, 9041, 9103, 9227, 9413, 9661, 10343, 10529, 11087

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[20, 20000, 31], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Apr 30 2011 *)
Select[Prime[Range[1400]], Mod[#, 31]==20&] (* Harvey P. Dale, Jul 30 2020 *)

Prog

(Magma) [p: p in PrimesUpTo(12000) | p mod 31 eq 20 ]; // Vincenzo Librandi, Aug 17 2012
(PARI) is(n)=isprime(n) && n%31==20 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040, A142005, A142006, A142023.

Sequence in context: A118506 A341230 A109563 * A300964 A077287 A087294

Adjacent sequences: A142021 A142022 A142023 * A142025 A142026 A142027

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved