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

Author

Zak Seidov, Oct 17 2006

Keywords

• nonn

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

Crossrefs

Cf. A122072.

Programs

PARI

p=2;forprime(q=3,1e5,if(q\10-p\10>1,print1(p", "));p=q) \\ Charles R Greathouse IV, Feb 26 2012

Formula

a(n) ~ n log n since this sequence contains almost all primes. [Charles R Greathouse IV, Feb 26 2012]