A186721 Numbers n such that n, 4n + 1 and 6n + 1 are all prime.

3, 7, 13, 37, 73, 277, 373, 577, 727, 853, 1033, 1063, 1327, 1423, 1453, 1567, 1777, 1987, 2293, 2677, 2767, 3037, 3163, 3307, 3457, 4273, 4447, 4993, 5197, 5557, 6247, 6673, 7573, 8353, 8893, 9067, 9397, 9463, 9547, 9613, 10303, 10903, 12007, 12973, 13177, 14083

Offset

1,1

Comments

Subsequence of A023212.

Links

Table of n, a(n) for n=1..46.

Mathematica

Join[{3}, Select[Range[7, 20000, 6], PrimeQ[#] && PrimeQ[4# + 1] && PrimeQ[6# + 1] &]]

Crossrefs

Cf. A023212.

Sequence in context: A049492 A166283 A350676 * A177945 A147448 A146449

Adjacent sequences: A186718 A186719 A186720 * A186722 A186723 A186724

Keyword

nonn

Author

Zak Seidov, Jan 21 2012

Status

approved