login
a(1)=1; a(n) is the minimal unused odd prime such that the sum a(1)+a(2)+...+a(n) is divisible by n.
0

%I #4 Oct 03 2014 12:01:42

%S 1,3,5,7,19,13,29,11,47

%N a(1)=1; a(n) is the minimal unused odd prime such that the sum a(1)+a(2)+...+a(n) is divisible by n.

%C Sequence is finite. The sum of the first 9 terms is 135. For the next term to give a sum that is a multiple of 10, the term must itself be divisible by 5. However, the prime 5 has already been used. - _Matthew Conroy_, Aug 28 2002

%K fini,full,nonn

%O 1,2

%A _Amarnath Murthy_, Aug 22 2002