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%I #18 Apr 12 2020 03:22:16
%S 1,1024,4398046511104,8796093022208,604462909807314587353088,
%T 309485009821345068724781056,1267650600228229401496703205376,
%U 5070602400912917605986812821504,784637716923335095479473677900958302012794430558004314112
%N Smallest power of 2 containing exactly n zeros.
%F a(n) = 2^A031146(n). - _M. F. Hasler_, Jun 15 2018 (corrected by _Sean A. Irvine_, Apr 11 2020)
%o (PARI) A031147(n)=for(k=n, oo, #select(d->!d, digits(2^k))==n&&return(2^k)) \\ _M. F. Hasler_, Jun 15 2018
%Y Cf. A031146.
%K nonn,easy,base
%O 0,2
%A _N. J. A. Sloane_
%E More terms from _Erich Friedman_
%E a(8) added by _M. F. Hasler_, Jun 16 2018
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