# [seqfan] Re: Is A109924 correct?

Lars Blomberg lars.blomberg at visit.se
Sun Jun 19 07:21:07 CEST 2011

```I thought "leading zero" referred to the palindrome, where
a(10) needs a leading 0 in order to be truly palindromic:
0,135444,949494,445310
and it is this leading zero that is suppressed.

I still fail to see why
a(10) = 135444,949494,445310 is correct
and a(2) = 60 is not.

-----Ursprungligt meddelande-----
From: Klaus Brockhaus
Sent: Saturday, June 18, 2011 10:33 PM
To: Sequence Fanatics Discussion list
Cc: Lars Blomberg
Subject: Re: [seqfan] Is A109924 correct?

Am 18.06.2011 07:39, schrieb Lars Blomberg:
> A109924 is defined as a(n)="Least palindromic multiple of concatenation
> 123...n"
> with the comment "Leading zeros are allowed (but are not shown)".
>
> An example of suppressed leading zeros is
> a(10) = 12345678910*10971041 = 135444,949494,445310
>
> But by the same rule shouldn't we have
> a(2) = 12*5 = 60 not 12*21 = 252
> a(5) = 12345*3034 = 37,454730 not 12345*43483 = 536,797635
> a(6) = 123456*37315 = 4606,760640 not  123456*50061 = 6180,330816
> ?
>
> /Lars B
>