A122384 Numbers appearing in A122072 at least three times.

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

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