

A110752


a(n) is the number of divisors of the concatenation of 1089 with itself n times.


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
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OFFSET

1,1


COMMENTS

1089 has the property that any number of concatenations of it with itself and its digit reversal have the same set of distinct prime factors.


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}] (* Ryan Propper, Oct 15 2005 *)


CROSSREFS

Cf. A110751, A110753.
Sequence in context: A265837 A264359 A280353 * A094973 A038780 A073984
Adjacent sequences: A110749 A110750 A110751 * A110753 A110754 A110755


KEYWORD

base,nonn


AUTHOR

Amarnath Murthy, Aug 11 2005


EXTENSIONS

a(19)a(30) from Ryan Propper, Oct 15 2005
Name edited by Jon E. Schoenfield, Nov 19 2018


STATUS

approved



