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A124411 Numbers k such that 2k+1, 4k+1, 6k+1, 8k+1, 10k+1 and 12k+1 are primes. 6
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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
Sequence in context: A253815 A083602 A105655 * A256809 A205939 A278585
KEYWORD
nonn
AUTHOR
Artur Jasinski, Oct 31 2006
EXTENSIONS
Extended by Ray Chandler, Nov 20 2006
STATUS
approved

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Last modified May 30 15:08 EDT 2024. Contains 372968 sequences. (Running on oeis4.)