login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A162214 a(n) = the largest positive multiple of n with exactly n digits when written in binary. 3
1, 2, 6, 12, 30, 60, 126, 248, 504, 1020, 2046, 4092, 8190, 16380, 32760, 65520, 131070, 262134, 524286, 1048560, 2097144, 4194300, 8388606, 16777200, 33554425, 67108860, 134217702, 268435440, 536870910, 1073741820, 2147483646, 4294967264, 8589934584 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = n * floor((2^n-1)/n). - Alois P. Heinz, Jul 11 2009

MAPLE

a:= n-> n*floor((2^n-1)/n): seq(a(n), n=1..40); # Alois P. Heinz, Jul 11 2009

MATHEMATICA

Array[# Floor[(2^# - 1)/#] &, 31] (* Michael De Vlieger, Nov 04 2017 *)

CROSSREFS

Cf. A162213.

Sequence in context: A058215 A330542 A166456 * A309728 A100071 A331552

Adjacent sequences:  A162211 A162212 A162213 * A162215 A162216 A162217

KEYWORD

base,nonn

AUTHOR

Leroy Quet, Jun 28 2009

EXTENSIONS

More terms from Alois P. Heinz, Jul 11 2009

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 July 15 00:36 EDT 2020. Contains 335762 sequences. (Running on oeis4.)