A090680 - OEIS

%I #5 Feb 22 2013 14:38:56

%S 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,

%T 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,

%U 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

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

%C 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.

%Y Cf. A033677.

%K easy,nonn

%O 2,6

%A _Philippe Deléham_, Dec 18 2003

%E More terms from Benoit Cloitre, Dec 23 2003