A135433 a(n) = number of primes that are the initial prime of a twin prime pair that are > (10^n)*(10^n+1) and < (10^n)*(10^n+1)+2*(10^n)+2.

2, 0, 3, 16, 75, 495, 3440, 25185

Offset

0,1

Links

Table of n, a(n) for n=0..7.

Example

3 and 5 are twin primes as are 5 and 7, 3 and 5 > 2 and < 6 so a(0)=2

Crossrefs

Sequence in context: A280180 A337995 A337994 * A223706 A347034 A261162

Adjacent sequences: A135430 A135431 A135432 * A135434 A135435 A135436

Keyword

hard,nonn

Author

Pierre CAMI, Dec 13 2007

Status

approved