A124411 Numbers k such that 2k+1, 4k+1, 6k+1, 8k+1, 10k+1 and 12k+1 are primes.

12705, 13020, 105525, 256410, 966840, 1707510, 1944495, 2310000, 2478630, 3132675, 3836070, 3976770, 4112430, 4532325, 5499585, 5920005, 6610485, 7390845, 8552250, 10739505, 11120340, 12231450, 12338130, 13243230, 16467255

Offset

1,1

Links

Jinyuan Wang, Table of n, a(n) for n = 1..100

Mathematica

Select[Range[10^7], And @@ PrimeQ /@ ({2, 4, 6, 8, 10, 12}*# + 1) &] (* Ray Chandler, Nov 20 2006 *)

Prog

(PARI) is(k) = sum(j = 1, 6, isprime(2*j*k+1)) == 6; \\ Jinyuan Wang, Aug 04 2019

Crossrefs

Cf. A005097, A005098, A024899, A005123, A024912, A110801, A123998, A124408, A124409, A124410, A071576.

Sequence in context: A253815 A083602 A105655 * A256809 A205939 A278585

Adjacent sequences: A124408 A124409 A124410 * A124412 A124413 A124414

Keyword

nonn

Author

Artur Jasinski, Oct 31 2006

Extensions

Extended by Ray Chandler, Nov 20 2006

Status

approved