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%I #9 Mar 09 2020 09:12:22
%S 0,11,101,0,10111,101111,1011001,10010101,100100111,1000001011,
%T 10000001101,100000001111,1000000111001,10000000001011,
%U 100000000100101,1000000000011101,10000000000001101,100000000000100111
%N Smallest n-digit prime containing only digits 0 and 1, or 0 if no such prime exists.
%H Jinyuan Wang, <a href="/A036929/b036929.txt">Table of n, a(n) for n = 1..500</a>
%o (PARI) a(n) = for(k=2^(n-1), 2^n-1, v=binary(k); if(ispseudoprime(p=fromdigits(v)), return(p))); 0; \\ _Jinyuan Wang_, Mar 09 2020
%Y Cf. A020449, A036229, A036928.
%K nonn,base
%O 1,2
%A _Patrick De Geest_, Jan 04 1999
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