login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A046291 Numbers k such that 2^k contains 2^5=32 as its largest proper substring of the form 2^m. 1
15, 25, 41, 45, 47, 65, 71, 73, 76, 82, 85, 95, 97, 100, 110, 112, 118, 120, 132, 137, 143, 145, 147, 151, 154, 156, 158, 160, 162, 164, 170, 179, 180, 185, 195, 196, 201, 214, 216, 219, 225, 227, 233, 235, 238, 251, 252, 275, 284, 290, 295, 297, 301, 304 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

If there is a term beyond a(108)=1862 it is larger than 10^5. - Giovanni Resta, Oct 14 2019

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..108

EXAMPLE

2^15 = {32}768;

2^25 = 335544{32};

2^41 = 219902{32}55552.

MATHEMATICA

sub2[n_] := Block[{s = ToString[2^n], k = n - 1}, While[k >= 0 && ! StringContainsQ[s, ToString[2^k]], k--]; k]; Select[Range[2000], sub2[#] == 5 &] (* Giovanni Resta, Oct 14 2019 *)

CROSSREFS

Cf. A033921.

Sequence in context: A133321 A031888 A299469 * A280406 A020302 A020202

Adjacent sequences:  A046288 A046289 A046290 * A046292 A046293 A046294

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Jun 15 1998

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 28 05:02 EST 2022. Contains 350654 sequences. (Running on oeis4.)