A074815 n is a term iff there are no prime numbers between reverse(n) and 3*n.

0, 14, 247, 298, 1003, 2998, 10003, 12473, 17525, 19995, 27528, 29998, 199995, 299998, 1000003, 1824745, 1875265, 1999995, 2124736, 2475247, 2700018, 3124739

Offset

0,2

Comments

n such that the number of primes between n and 3n (inclusive) = number of primes between n and reverse(n) (inclusive).

Links

Table of n, a(n) for n=0..21.

Example

14 is here since there are seven primes between 14 and 41 and seven primes between 14 and 3*14=42.

Crossrefs

Sequence in context: A326651 A055477 A123774 * A280122 A051622 A113377

Adjacent sequences: A074812 A074813 A074814 * A074816 A074817 A074818

Keyword

base,nonn

Author

Jason Earls, Sep 08 2002

Extensions

More terms from Lior Manor Sep 17 2002

Status

approved