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A062767
Numbers k such that 3k+1, 3k+5 and 3k+7 are all prime.
1
2, 4, 12, 22, 32, 34, 64, 74, 92, 102, 152, 204, 274, 284, 292, 362, 432, 474, 482, 494, 554, 564, 594, 622, 624, 664, 694, 712, 792, 894, 902, 932, 1054, 1084, 1152, 1154, 1282, 1384, 1504, 1594, 1742, 1804, 1812, 1882, 1884, 1912, 2182, 2274, 2402, 2584
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[2600], PrimeQ[3#+1] && PrimeQ[3#+5] && PrimeQ[3#+7] &] (* Stefano Spezia, Sep 23 2024 *)
PROG
(PARI) j=[]; for(n=1, 10000, if(isprime(3*n+1) && isprime(3*n+5) && isprime(3*n+7), j=concat(j, n))); j
CROSSREFS
Sequence in context: A375742 A343865 A376006 * A173650 A303030 A291404
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 17 2001
STATUS
approved