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A033656
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Trajectory of 21 under map x->x + (x-with-digits-reversed).
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0
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21, 33, 66, 132, 363, 726, 1353, 4884, 9768, 18447, 92928, 175857, 934428, 1758867, 9447438, 17794887, 96644658, 182289327, 906271608, 1712444217, 8836886388, 17673772776, 85401510447, 159803020905
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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FORMULA
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MATHEMATICA
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NestList[#+IntegerReverse[#]&, 21, 30] (* Harvey P. Dale, Dec 16 2021 *)
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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