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%I #11 Mar 09 2020 09:12:59
%S 3,37,337,3373,33377,333337,3333373,33333373,333337777,3333733373,
%T 33333333377,333333733333,3333333377377,33333333373777,
%U 333333333337337,3333333333373777,33333333333337337,333333333333337333
%N Smallest n-digit prime containing only digits 3 and 7, or 0 if no such prime exists.
%H Jinyuan Wang, <a href="/A036942/b036942.txt">Table of n, a(n) for n = 1..500</a>
%Y Cf. A020463, A036229, A036316.
%K nonn,base
%O 1,1
%A _Patrick De Geest_, Jan 04 1999