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A157756
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.
0
0, 11, 24, 39, 45, 51, 74, 97, 103, 150, 151, 155, 220, 224, 225, 229, 230, 234, 240, 290, 291, 330, 349, 363, 373, 383, 420, 424, 425, 429, 445, 458, 460, 464, 470, 474, 475, 479, 480, 484, 491, 503, 504, 508, 515, 525, 529, 557, 564, 576, 577, 581, 591
OFFSET
1,2
COMMENTS
Example 3480 belongs to the sequence, because 34^2 - 80 = 1076 --> 10^2 - 76 = 24 --> 2^2 - 4 = 0.
LINKS
Jean-Marc Falcoz, Illustration of directed graph, zoomable picture (up to 1000).
Jean-Marc Falcoz, List of terms up to 11000.
CROSSREFS
Sequence in context: A213991 A269100 A213062 * A061043 A349487 A098603
KEYWORD
base,easy,nonn
AUTHOR
Jean-Marc Falcoz, Mar 06 2009
STATUS
approved