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A120222
Numbers k such that 6+k and 6*k+1 are prime.
2
1, 5, 7, 11, 13, 17, 23, 25, 35, 37, 47, 55, 61, 73, 77, 83, 91, 95, 101, 103, 107, 121, 125, 131, 143, 151, 161, 173, 175, 187, 205, 217, 221, 233, 245, 257, 263, 271, 277, 287, 305, 311, 325, 331, 347, 367, 373, 391, 395, 425, 443, 451, 455, 461, 481, 503, 551
OFFSET
1,2
COMMENTS
All terms == 1 or 5 (mod 6). - Robert Israel, Oct 29 2020
LINKS
MAPLE
select(n -> isprime(n+6) and isprime(6*n+1), [seq(i, i=1..1000, 2)]); # Robert Israel, Oct 29 2020
MATHEMATICA
Select[Range[551], PrimeQ[#+6]&&PrimeQ[6#+1]&] (* James C. McMahon, Sep 26 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Jun 10 2006
STATUS
approved