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a(1) = 1, then least square such that every partial concatenation is a prime.
0

%I #5 Dec 05 2013 19:56:37

%S 1,1,81,729,441,729,81,1521,59049,1521,9,13689,1089,159201,62001,

%T 363609,4761,1521,8649,1147041,110889,29241,233289,370881,558009,7569,

%U 710649,59049,184041,301401,56169,77841,71289,233289,81,91809,1535121,9018009

%N a(1) = 1, then least square such that every partial concatenation is a prime.

%C a(n) == 0 (mod 9) for n>1. Conjecture: Sequence is infinite.

%e 11,1181,1181729 etc. are primes.

%K base,nonn

%O 0,3

%A _Amarnath Murthy_, Nov 27 2003

%E More terms from _David Wasserman_, Oct 21 2005