A299159 Numbers k such that 4*k-1, 6*k-1 and 12*k-1 are prime.

1, 2, 5, 15, 32, 42, 60, 110, 120, 152, 215, 242, 260, 315, 357, 390, 392, 425, 470, 495, 560, 732, 735, 840, 1055, 1082, 1127, 1275, 1307, 1352, 1457, 1562, 1590, 1755, 1782, 1797, 1887, 1925, 1967, 2055, 2112, 2132, 2150, 2175, 2205, 2360, 2387, 2472, 2517, 2567, 2667, 2717, 2822, 2882, 2930, 2945

Offset

1,2

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Maple

select(j -> isprime(4*j-1) and isprime(6*j-1) and isprime(12*j-1), [$1..10000]);

Mathematica

Select[Range[3000], And@@PrimeQ/@({4, 6, 12} # - 1) &] (* Vincenzo Librandi, Feb 04 2018 *)

Prog

(Magma) [n: n in [0..3000] |IsPrime(4*n-1) and IsPrime(6*n-1) and IsPrime(12*n-1)]; // Vincenzo Librandi, Feb 04 2018

Crossrefs

Cf. A299068.

Sequence in context: A309272 A077686 A034499 * A006451 A226103 A000962

Adjacent sequences: A299156 A299157 A299158 * A299160 A299161 A299162

Keyword

nonn

Author

Robert Israel, Feb 04 2018

Status

approved