[seqfan] Re: correcting A181539

[N. J. A. Sloane]

Bob Wilson wrote to me about this sequence,
pointing out that it did not
match the definition, and offering to edit it.
Bob, what did you come up with?
Neil

>The current A181539 does not seem to match its definition:
>for example, why a(2)=51 and not a(2)=49 (let alone a(2)=1)?

>I would rather change the definition to:

>a(n) = smallest number m > 1 such that m^2 == 1 (mod 10^n)

>that would give a sequence:

>9, 49, 249, 1249, 18751, 218751, 781249, 24218751, 74218751,
>1425781249, 13574218751, 163574218751, 163574218751, 19836425781249,
>19836425781249, 2480163574218751, 12519836425781249,
>12519836425781249, 487480163574218751, 15487480163574218751,
>215487480163574218751, 215487480163574218751, 4784512519836425781249,
>45215487480163574218751, 45215487480163574218751

>Regards,
>Max

>On Wed, Nov 3, 2010 at 8:29 AM, Richard Mathar
><mathar at strw.leidenuniv.nl> wrote:
>>
>> Is there a way to keep the terms in http://oeis.org/classic/A181539
>> (current definition m: m^2 =1 (mod 10^n) by changing the definition? I'd expect
>> some corresponding terms of http://oeis.org/classic/A181607 Â to appear, but I
>> cannot figure out which modification in A181539 would do that
>> selection/matching.
>>