The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A067267 Numbers n such that n, 10*n+1, 10*n+3, 10*n+7 and 10*n+9 are all primes. 8
 19, 6949, 10111, 15727, 20149, 24799, 26041, 26881, 29587, 29947, 40213, 41203, 44257, 46747, 47701, 49057, 50023, 51061, 55921, 66109, 66643, 73939, 76819, 79579, 95947, 106501, 110083, 111781, 112213, 114679 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms == 1 (mod 6). - Robert Israel, Jan 22 2018 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE a(1)=19 because 191, 193, 197 and 199 are all prime. MAPLE select(t -> andmap(isprime, [t, 10*t+1, 10*t+3, 10*t+7, 10*t+9]), [seq(i, i=1..2*10^5, 6)]); # Robert Israel, Jan 22 2018 MATHEMATICA okQ[n_]:=Module[{n10=10n}, And@@PrimeQ[{n10+1, n10+3, n10+7, n10+9}]] Select[Prime[Range[20000]], okQ] (* Harvey P. Dale, Dec 13 2010 *) Select[Prime[Range[11000]], AllTrue[10#+{1, 3, 7, 9}, PrimeQ]&] (* Harvey P. Dale, Feb 23 2022 *) CROSSREFS Cf. A007811. Sequence in context: A172662 A201303 A013724 * A340165 A124989 A265964 Adjacent sequences: A067264 A067265 A067266 * A067268 A067269 A067270 KEYWORD nonn AUTHOR Sudipta Das (juitech(AT)vsnl.net), Feb 21 2002 STATUS approved

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

Last modified December 8 22:05 EST 2022. Contains 358698 sequences. (Running on oeis4.)