A142195 Primes congruent to 31 mod 40.

31, 71, 151, 191, 271, 311, 431, 631, 751, 911, 991, 1031, 1151, 1231, 1471, 1511, 1831, 1871, 1951, 2111, 2311, 2351, 2551, 2591, 2671, 2711, 2791, 3191, 3271, 3391, 3511, 3631, 3671, 3911, 4111, 4231, 4271, 4391, 4591, 4751, 4831, 4871, 4951, 5231, 5351

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[{31}, Mod[#, 40]]&] (* Vincenzo Librandi, Aug 22 2012 *)

Prog

(Magma) [p: p in PrimesUpTo(7000) | p mod 40 eq 31 ]; // Vincenzo Librandi, Aug 22 2012
(PARI) is(n)=isprime(n) && n%40==31 \\ Charles R Greathouse IV, Jul 03 2016

Crossrefs

Cf. A000040.

Sequence in context: A127191 A003542 A055781 * A237992 A356457 A139975

Adjacent sequences: A142192 A142193 A142194 * A142196 A142197 A142198

Keyword

nonn,easy

Author

N. J. A. Sloane, Jul 11 2008

Status

approved