A122091 Numbers appearing in A122072 at least twice.

199, 317, 509, 523, 619, 839, 887, 1069, 1129, 1259, 1327, 1409, 1459, 1499, 1637, 1669, 1709, 1759, 1789, 1847, 1889, 1913, 1951, 2039, 2069, 2099, 2179, 2311, 2357, 2399, 2477, 2503, 2557, 2579, 2819, 2939, 2971, 3049, 3089, 3137, 3169, 3229, 3259

Offset

1,1

Comments

Necessary condition: p is followed by a prime gap of at least 12. Sufficient condition: p is followed by a prime gap of at least 20. [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>1, print1(p", ")); p=q) \\ Charles R Greathouse IV, Feb 26 2012

Crossrefs

Cf. A122072.

Sequence in context: A213078 A142682 A088294 * A142749 A142123 A046006

Adjacent sequences: A122088 A122089 A122090 * A122092 A122093 A122094

Keyword

nonn

Author

Zak Seidov, Oct 17 2006

Status

approved