OFFSET
0,2
COMMENTS
If it exists, a(115) > 10^5. - Michel Marcus, Oct 19 2016
LINKS
Michel Marcus, Table of n, a(n) for n = 0..114
PROG
(PARI) a(n) = {my(k = 0); while (#select(x->(x==0), digits(2^k, 3)) != n, k++); k; } \\ Michel Marcus, Oct 19 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Mar 01 2005
STATUS
approved