A299159 - OEIS

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

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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