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
Keywords
Links
- Robert Israel, Table of n, a(n) for n = 1..10000
Crossrefs
Cf. A299068.
Programs
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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
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Maple
select(j -> isprime(4*j-1) and isprime(6*j-1) and isprime(12*j-1), [$1..10000]);
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Mathematica
Select[Range[3000], And@@PrimeQ/@({4, 6, 12} # - 1) &] (* Vincenzo Librandi, Feb 04 2018 *)