OFFSET
1,1
EXAMPLE
2^105 = 40564{8192}07303340847894502572032.
MATHEMATICA
sub2[n_] := Block[{s = ToString[2^n], k = n - 1}, While[k >= 0 && ! StringContainsQ[ s, ToString[2^k]], k--]; k]; Select[Range[1513], sub2[#] == 13 &] (* Giovanni Resta, Oct 14 2019 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Jun 15 1998
EXTENSIONS
Definition and offset changed by M. F. Hasler, Oct 11 2019
STATUS
approved