login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A110752 a(n) = Tau(N), where N = the number obtained as a concatenation of 1089 with itself n times. Tau(n) = number of divisors of n. 3
9, 36, 192, 144, 288, 1536, 576, 4608, 3840, 4608, 3072, 12288, 1152, 9216, 1572864, 73728, 2304, 245760, 144, 73728, 4718592, 49152, 2304, 6291456, 294912, 18432, 589824, 294912, 18432, 100663296 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

1089 has the property that any number of concatenation of it with self and the digit reversal have same prime divisors.

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

a(2) =tau(10891089) = 36.

MATHEMATICA

k = 0; Do[k = 10^4 * k + 1089; Print[DivisorSigma[0, k]], {n, 1, 30}] (Propper)

CROSSREFS

Cf. A110751, A110753.

Sequence in context: A002063 A075674 A245416 * A094973 A038780 A073984

Adjacent sequences:  A110749 A110750 A110751 * A110753 A110754 A110755

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Aug 11 2005

EXTENSIONS

More terms from Ryan Propper, Oct 15 2005

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified December 21 05:22 EST 2014. Contains 252296 sequences.