# [seqfan] Re: Digit Spiral

Eric Angelini Eric.Angelini at kntv.be
Thu Feb 26 14:21:06 CET 2009

```Hello Paolo and Seq Fans,

I cannot explain what I had in mind -- this is too difficult
for me as my english is too bad.

mess, I will post to a french math group !

Best,
É.

-----Message d'origine-----
De : seqfan-bounces at list.seqfan.eu [mailto:seqfan-bounces at list.seqfan.eu] De la part de Paolo Lava
Envoyé : jeudi 26 février 2009 11:40
À : Sequence Fanatics Discussion list
Objet : [seqfan] Re: Digit Spiral

Dear Eric and seqfans,

rule 2) tells to consider "the last integer fitting perfectly in a [square of
unit-squares]". In my understanding it means that I have to consider the last integer I can "totally" write approaching the lower left corner of the building square. Is it correct? In this case the sequence is:

0,3,12,22,36,54,76,101,121,143 (two more [square of unit-squares]left to complete the new square),169,197,227 (again two more [square of unit-squares]left to complete the new square),261,297,335(again two more [square of unit-squares]left to complete the new square),377, etc..

Ciao.

Paolo

--- Eric.Angelini at kntv.be wrote:

From: "Eric Angelini" <Eric.Angelini at kntv.be>
To: "Sequence Fanatics Discussion list" <seqfan at list.seqfan.eu>
Subject: [seqfan]  Digit Spiral
Date: Wed, 25 Feb 2009 18:57:20 +0100

(Inspired by another spiral just seen here)

---

1) start to write on a grid the nonnegative integers so to form a spiral
(one digit clockwise per unit-square);
2) make a pause for the last integer fitting perfectly in a [square of
unit-squares] -- else proceed;
3) colour this last integer in yellow;
4) call S the sequence of yellow terms.

Best,
É.

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