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A157756
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Integers n such that by splitting their digits in two equal parts, the difference between the square of the first part and the second part eventually reaches 0 by iterating the process. If length is odd, split (length+1)/2 , (length-1)/2
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0
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0, 11, 24, 39, 45, 51, 74, 97, 103, 150, 151, 155, 220, 224, 225, 229, 230, 234, 240, 290
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Example 3480 belongs to the sequence, because 34^2-80 = 1076 --> 10^2-76 = 24 --> 2^2-4 = 0
Nice zoomable picture of the directed graph (up to 1000) :
http://vargo.chez.com/upto1000.jpg
or if you prefer a GIF :
http://vargo.chez.com/upto1000.gif
The terms up to 11000 :
http://vargo.chez.com/upto11000.txt
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CROSSREFS
| Sequence in context: A051909 A112134 A063307 * A061043 A098603 A053061
Adjacent sequences: A157753 A157754 A157755 * A157757 A157758 A157759
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KEYWORD
| base,easy,nonn
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AUTHOR
| Jean-Marc Falcoz (jeanmarcfalcoz(AT)vtxnet.ch), Mar 06 2009
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