[seqfan] Digit Spiral

Eric Angelini Eric.Angelini at kntv.be
Wed Feb 25 18:57:20 CET 2009

(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.



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