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A158029 Sides of squares which are filled exactly (no holes, no overlaps) by the digits needed to write a subsequence of consecutive square numbers, starting with 0. 1

%I

%S 1,2,4,5,7,8,22,23,27,28,32,33,37,77,84,91,98,105,112,119,126,133,140,

%T 521,529,531,539,541,549,551,559,561,569,571,579,581,589,591,599,601,

%U 609,611,619,621,629,631,639,641,649,651,659,661,669,671

%N Sides of squares which are filled exactly (no holes, no overlaps) by the digits needed to write a subsequence of consecutive square numbers, starting with 0.

%C The square numbers fitting exactly in a "squares-digits square" are given by A158028. Terms computed by Jean-Marc Falcoz.

%H Eric Angelini, <a href="http://www.cetteadressecomportecinquantesignes.com/DigitSpiral.htm">Digit Spiral</a>

%H E. Angelini, <a href="/A158022/a158022.pdf">Digit Spiral</a> [Cached copy, with permission]

%e ...0...01...0116...01161

%e .......49...4964...49640

%e ............2539...25390

%e ............6481...64811

%e ...................21144

%e The above squares, filled exactly by a subsequence of consecutive square numbers starting with 0 have sides 1, 2, 4, 5. There is no side-3 square with this property. The next properly filled square will have side 7.

%K base,nonn

%O 1,2

%A _Eric Angelini_, Mar 11 2009

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Last modified October 17 17:21 EDT 2021. Contains 348065 sequences. (Running on oeis4.)