%I #7 Dec 05 2013 19:57:05
%S 1,3,3,15,75,525,7875,126000,2520000,30240000,151200000,5594400000,
%T 341258400000,21840537600000,1310432256000000,23587780608000000,
%U 1533205739520000000,222314832230400000000,20452964565196800000000
%N a(1) = 1; for n>1, a(n) = least multiple of a(n1) such that the termwise concatenation of a(n), a(n1),...a(2), a(1) is prime.
%H Diana Mecum, <a href="/A111674/b111674.txt">Table of n, a(n) for n = 1..41</a>
%e 31,331,15331,7515331, ... are all primes.
%Y Cf. A111675.
%K base,nonn
%O 1,2
%A _Amarnath Murthy_, Aug 15 2005
%E More terms from _Diana L. Mecum_, Jun 26 2007
