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%I #5 Oct 10 2019 00:35:26
%S 0,0,0,0,5,2,409,163,6553,2621,857,419,1677721,71,43,107,4294967,
%T 171798691,6871947673,779069,511627,4398046511,18604441,703687441,
%U 28147497671,11258999,59962737049,180143985094819,759403792793
%N Largest prime substring in 4^n (0 if none).
%Y Cf. A046262.
%K nonn
%O 0,5
%A _Patrick De Geest_, Jun 15 1998
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