login
a(n+1) is the smallest square > a(n) such that every concatenation (n > 1) is a prime.
1

%I #4 Dec 05 2013 19:56:21

%S 1,9,49,81,441,729,15129,33489,35721,127449,184041,288369,505521,

%T 594441,1046529,4004001,4941729,8415801,14130081,19474569,20820969,

%U 21427641,25070049,31236921,33419961,37197801,57471561,58201641,58844241

%N a(n+1) is the smallest square > a(n) such that every concatenation (n > 1) is a prime.

%e 19, 1949, 194981, 194981441 are all primes.

%Y Cf. A087353.

%K base,nonn

%O 1,2

%A _Amarnath Murthy_, Sep 08 2003

%E More terms from _David Wasserman_, May 10 2005