A090680 Number of primes p such that n < p < n+A033677(n).

1, 1, 1, 1, 1, 2, 1, 1, 2, 3, 1, 3, 2, 2, 2, 4, 2, 4, 1, 1, 3, 5, 1, 1, 3, 2, 2, 6, 1, 7, 1, 3, 4, 2, 2, 9, 4, 3, 3, 9, 2, 9, 2, 2, 5, 9, 1, 1, 2, 4, 3, 11, 2, 2, 2, 5, 7, 13, 2, 12, 6, 2, 2, 3, 1, 13, 4, 5, 3, 14, 2, 13, 8, 3, 3, 2, 3, 15, 2, 2, 8, 15, 1, 3, 8, 7, 2, 16, 1, 3, 6, 6, 10, 6, 4, 19, 4, 4, 4, 20, 4, 19, 3, 3, 10, 19, 2, 18, 1, 5, 1, 18, 2, 3, 4, 1, 10, 2, 2, 2, 12, 8, 6, 5, 4, 23, 3, 8, 3, 23, 2, 4, 14

Offset: 2

Author

Philippe Deléham, Dec 18 2003

Keywords

• easy
• nonn

Comments

Conjecture: no a(n) is zero. Example: n=15: A033677(15) = 5; 2 primes between 15 and 15+5=20 (17 and 19), so a(15) = 2.

Crossrefs

Cf. A033677.

Extensions

More terms from Benoit Cloitre, Dec 23 2003