The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons 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 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A122384 Numbers appearing in A122072 at least three times. 2
 1129, 1327, 1669, 2179, 2477, 3137, 3229, 3469, 3739, 4177, 4297, 4759, 4831, 5119, 5237, 5351, 5449, 5591, 5749, 5953, 6397, 6491, 6737, 6917, 7079, 7129, 7253, 7369, 7759, 7963, 8329, 8389, 8467, 8893, 9067, 9349, 9439, 9551, 9973, 10009, 10039 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Necessary condition: p is followed by a prime gap of at least 22. Sufficient condition: p is followed by a prime gap of at least 30. [Charles R Greathouse IV, Feb 26 2012] LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..10000 FORMULA a(n) ~ n log n since this sequence contains almost all primes. [Charles R Greathouse IV, Feb 26 2012] PROG (PARI) p=2; forprime(q=3, 1e5, if(q\10-p\10>2, print1(p", ")); p=q) \\ Charles R Greathouse IV, Feb 26 2012 CROSSREFS Cf. A122091, A122072. Sequence in context: A278434 A198469 A082888 * A218041 A061779 A218159 Adjacent sequences:  A122381 A122382 A122383 * A122385 A122386 A122387 KEYWORD nonn AUTHOR Zak Seidov, Oct 19 2006 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 December 3 22:32 EST 2021. Contains 349468 sequences. (Running on oeis4.)