%I #5 Mar 30 2012 17:29:13
%S 13,1,2,19,3,8,15,18,10,17,45,24,22,11,37,5,30,39,81,6,76,57,69,56,84,
%T 36,49,48,38,63,148,27,75,239,31,50,171,67,116,282,42,175,23,55,236,
%U 70,278,73,90,140,91,9,210,174,126,105,89,94,224,34,114,26,133,143,54,241
%N a(1) = 13. For n > 1, a(n) is the least unused number such that every concatenation a(n)a(n-1)...a(2)a(1) is prime.
%C Is this a rearrangement of the natural numbers?
%Y Cf. A089710, A089711, A089560-A089573.
%K base,nonn
%O 1,1
%A _Ray Chandler_, Nov 22 2003
%E Edited by _Charles R Greathouse IV_, Apr 29 2010