The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A186721 Numbers n such that n, 4n + 1 and 6n + 1 are all prime. 1
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Subsequence of A023212. LINKS MATHEMATICA Join[{3}, Select[Range[7, 20000, 6], PrimeQ[#] && PrimeQ[4# + 1] && PrimeQ[6# + 1] &]] CROSSREFS Cf. A023212. Sequence in context: A106057 A049492 A166283 * A177945 A147448 A146449 Adjacent sequences:  A186718 A186719 A186720 * A186722 A186723 A186724 KEYWORD nonn AUTHOR Zak Seidov, Jan 21 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 22 16:29 EST 2020. Contains 331152 sequences. (Running on oeis4.)