A089339 - OEIS

%I #4 Dec 05 2013 19:56:35

%S 0,0,0,1,1,0,1,1,1,2,1,1,1,0,2,3,1,1,3,2,2,3,2,3,1,2,4,2,2,4,3,2,6,2,

%T 4,5,2,2,7,2,2,6,2,3,5,4,2,4,4,3,3,3,2,8,3,5,6,3,3,7,5,4,9,2,4,5,5,4,

%U 6,3,2,9,2,4,10,2,6,8,3,4,8,7,4,8,6,5,11,7,4,8,3,2,8,9,3,10,4,7,7,4,4,11,5

%N Number of primes beginning with n and of the form n concatenated with p where p takes all the prime values less than n.

%C Conjecture: There are finitely many zeros in this sequence. What is the largest value of n such that a(n) = 0? Perhaps n = 14.

%e a(10) = 2 and 103 and 107 are the associated primes.

%Y Cf. A089340.

%K base,nonn

%O 1,10

%A _Amarnath Murthy_, Nov 04 2003

%E Corrected and extended by _Ray Chandler_, Nov 07 2003