A062767 Numbers k such that 3k+1, 3k+5 and 3k+7 are all prime.

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

Seiichi Manyama, Table of n, a(n) for n = 1..10000

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

Adjacent sequences: A062764 A062765 A062766 * A062768 A062769 A062770

Keyword

nonn,changed

Author

Jason Earls, Jul 17 2001

Status

approved