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%I #5 Oct 10 2019 00:35:37
%S 0,3,0,7,0,43,29,7,61,683,9049,71,53,59,7829,4348907,3046721,40163,89,
%T 62261467,84401,353203,1381,941,2429536481,288609443,8329,6255974849,
%U 876792454961,77364883,113209,3962839,853020188851,555523
%N Largest prime substring in 3^n (0 if none).
%Y Cf. A046261.
%K nonn
%O 0,2
%A _Patrick De Geest_, Jun 15 1998
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