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A096999
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A062401(x)=phi[sigma(x)] function is iterated; initial value=2^n; a(n)=largest term of trajectory.
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0
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2, 6, 8, 30, 96, 126, 128, 480, 600, 3840, 2048, 8190, 10584, 27000, 32768, 196560, 311040, 851840, 1161216, 2250600, 2640704, 150992640, 150992640, 283740364800, 283740364800, 283740364800, 283740364800, 7608287232, 7608287232
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| n=8: 2^n=256, list={256,432,480,432,...}, max=a(8)=480
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MATHEMATICA
| fs[x_] :=EulerPhi[DivisorSigma[1, x]] itef[x_, hos_] :=NestList[fs, x, hos] Table[Max[itef[2^w, 200]], {w, 1, 30}]
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CROSSREFS
| Cf. A000010, A000203, A062401, A096852.
Sequence in context: A053287 A086323 A075999 * A019199 A094678 A076507
Adjacent sequences: A096996 A096997 A096998 * A097000 A097001 A097002
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jul 21 2004
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