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!)
A145119 a(n) = Product_{k=1..n-1} (ceiling(n/k) - ceiling(n/k) mod 2). 0
1, 2, 4, 16, 32, 96, 384, 1024, 2048, 10240, 30720, 73728, 294912, 688128, 1835008, 12582912, 25165824, 56623104, 283115520, 629145600, 1887436800, 11072962560, 26575110144, 57982058496, 231928233984, 753766760448, 1758789107712 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Bounded by A010786 and A131385.

Each term has many more factors of two than any other prime factor.

LINKS

Table of n, a(n) for n=1..27.

PROG

(PARI) a(n) = prod(k=1, n-1, ceil(n/k) - ceil(n/k) % 2); \\ Michel Marcus, Nov 17 2019

CROSSREFS

Cf. A010786, A131385, A131387.

Sequence in context: A171381 A334083 A274497 * A081411 A269758 A094384

Adjacent sequences:  A145116 A145117 A145118 * A145120 A145121 A145122

KEYWORD

easy,nonn

AUTHOR

Reikku Kulon, Oct 02 2008

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 August 14 15:36 EDT 2020. Contains 336481 sequences. (Running on oeis4.)