login
A046295
Numbers k such that 2^k contains 2^9=512 as its largest proper substring of the form 2^m.
0
109, 135, 192, 209, 221, 223, 231, 241, 259, 266, 277, 283, 285, 293, 302, 305, 309, 314, 323, 333, 344, 345, 359, 382, 387, 400, 402, 407, 409, 413, 415, 421, 431, 443, 451, 472, 476, 485, 501, 509, 526, 529, 537, 540, 548, 551, 556, 561, 566, 573, 574
OFFSET
1,1
EXAMPLE
2^135 = 435561429658801233233119497{512}66331066368.
MATHEMATICA
sub2[n_] := Block[{s = ToString[2^n], k = n - 1}, While[k >= 0 && ! StringContainsQ[s, ToString[2^k]], k--]; k]; Select[Range[574], sub2[#] == 9 &] (* Giovanni Resta, Oct 14 2019 *)
CROSSREFS
Cf. A033921.
Sequence in context: A039492 A253155 A095609 * A164288 A325074 A182476
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Jun 15 1998
STATUS
approved