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Search: id:A097029
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| A097029 |
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Fixed points when the function f[x]=EulerPhi[x]+Floor[x/2] is iterated, i.e. solutions to f[x]=x. |
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4
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| 1, 2, 3, 4, 8, 15, 16, 32, 64, 128, 255, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65535, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Trivial fixed points are the powers of 2. How many nontrivial cases exist like 3,15,255,65535: the first 5 terms of A051179. More?
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EXAMPLE
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For fixed points the cycle lengths are A097026(n=fix)=1, but the reverse is not true because long transients may also lead to 1-cycles.
So eg. 1910 is not here because its terminal 1-cycle is prefixed by a long transient:{1910, 1715, 2033, 2924, 2806, 2723, 3689, 4724, 4722, 3933, 4342, 4163, 6041, 8192, 8192}.
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CROSSREFS
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Cf. A000010, A097026, A097028, A097029, A051179.
Sequence in context: A006755 A005853 A161460 this_sequence A122774 A118841 A126294
Adjacent sequences: A097026 A097027 A097028 this_sequence A097030 A097031 A097032
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Aug 27 2004
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