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Search: id:A077094
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| A077094 |
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Starting the iteration of the function Phi[]*(Sigma[]-Phi[]) at these initial values leads to the fixed point 4. |
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+0
1
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| 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 25, 26, 27, 28, 30, 32, 33, 34, 35, 38, 39, 44, 45, 46, 49, 51, 54, 55, 56, 57, 58, 62, 63, 65, 68, 70, 77, 85, 87, 91, 93, 95, 99, 104, 111, 119, 121, 129, 134, 143, 145, 153, 158, 161, 169, 189, 205, 209, 215, 221, 245
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Probably this sequence is finite, with 92 terms of which the last is 6241.
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EXAMPLE
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n=6241: FixedPointList={6241,104,54,32,20,16,22,12,8,10,6,4},end=4.
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MATHEMATICA
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f[x_] := EulerPhi[DivisorSigma[1, x]-EulerPhi[x]] Do[s=NestList[f, n, 100]; s1=Part[s, 99]; s2=Part[s, 100]; If[Equal[s1, s2]&&Equal[s1, 4], Print[{n, s1}]], {n, 1, 1000000}]
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CROSSREFS
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Cf. A077090-A077100.
Sequence in context: A046349 A115683 A091212 this_sequence A070807 A046352 A046355
Adjacent sequences: A077091 A077092 A077093 this_sequence A077095 A077096 A077097
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KEYWORD
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nonn,fini
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Oct 31 2002
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