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A046268 Largest prime substring in 2^n (0 if none). 2

%I

%S 0,2,0,0,0,3,0,2,5,5,2,2,409,19,163,7,6553,131,2621,5,857,971,419,83,

%T 1677721,5443,71,1342177,43,709,107,83,4294967,89,171798691,3597383,

%U 6871947673,3743895347,779069,54975581,511627,99023,4398046511,79609

%N Largest prime substring in 2^n (0 if none).

%e 2^37 = 1{3743895347}2.

%Y Cf. A046260.

%K nonn

%O 0,2

%A _Patrick De Geest_, Jun 15 1998

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Last modified January 24 16:47 EST 2020. Contains 331209 sequences. (Running on oeis4.)