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%I #32 Mar 03 2024 10:16:23
%S 1,2,7,11,19,13,9,21,43,3,31,49,17,37,29,41,27,39,67,33,81,53,51,23,
%T 89,91,59,47,73,61,87,99,79,63,117,113,77,127,103,93,111,71,69,101,
%U 147,57,97,133,119,121,139,131,107,157,151,123,153,83,143,169,109,137
%N a(1) = 1, a(2) = 2, a(n) = smallest number not occurring earlier such that the concatenation a(n-2), a(n-1) and a(n) is a prime.
%H Seiichi Manyama, <a href="/A289994/b289994.txt">Table of n, a(n) for n = 1..1000</a>
%e 127, 2711, 71119, 111913, ... are primes.
%Y Cf. A075607, A073676, A083754, A110772.
%K nonn,base
%O 1,2
%A _Seiichi Manyama_, Sep 02 2017
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