question on sequence format and PARI/GK questions

[N. J. A. Sloane]

seq(n) = d1,c1,a1,b1,d2,c2,a2,b2, ...,dn,cn,an,bn,...,
 of a sequence acceptable:?
submit as 4 separate sequences to the OEIS (get 4 A-numbers
 Neil J. A. Sloane
 AT&T Shannon Labs, Room C233, 
 180 Park Avenue, Florham Park, NJ 07932-0971
 Email: njas at research.att.com
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 Home page: http://www.research.att.com/~njas/
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Date: Sun, 25 Nov 2007 14:12:14 -0400
From: "Maximilian Hasler" <maximilian.hasler at gmail.com>
To: grafix at csl.pl
Subject: Re: Question
Cc: seqfan <seqfan at ext.jussieu.fr>
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A053228 does not contain 104

in A087113  is written	FORMULA 	a(n)=A005843(n).

max number of digits of square of  n  digits  is  length((10^n-1)^2),
isn't it ?
Since (a-1)² = a²-2a+1 this is indeed = 2n for all n.

Maximilian

On 11/24/07, Artur <grafix at csl.pl> wrote:
> Does A053228 <http://www.research.att.com/%7Enjas/sequences/A053228>
> identical with A087113
> <http://www.research.att.com/%7Enjas/sequences/A087113> and that same as
> A005843 <http://www.research.att.com/%7Enjas/sequences/A005843> with
> offset 2
> If not to which I can add "maximal number of digits in square of number
> with n digits"
> realized by Mathematica procedure:
> a = {}; k = 9; Do[w = k^2; c = Length[IntegerDigits[w]];
>     AppendTo[a, c]; k = k + 9*10^n, {n, 1, 100}]; a
>
> ARTUR
>
>