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Search: id:A126974
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| 0, 1, 2, 3, 4, 4, 5, 6, 6, 6, 7, 7, 8, 7, 9, 10, 11, 8, 9, 10, 10, 9, 10, 12, 12, 10, 11, 11, 12, 12, 13, 14, 13, 13, 15, 13, 14, 11, 15, 16, 17, 13, 14, 14, 16, 12, 13, 16, 15, 14, 17, 16, 17, 14, 19, 18, 16, 14, 15, 17, 18, 15, 17, 19, 19, 16, 17, 18, 17, 18, 19, 19, 20, 16, 20
(list; graph; listen)
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OFFSET
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1,3
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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MAPLE
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with(numtheory): a[1]:=0: a[2]:=1: for n from 3 to 90 do a[n]:=a[tau(n)]+a[phi(n)] od: seq(a[n], n=1..90); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 24 2007
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MATHEMATICA
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f[l_List] := Block[{n = Length[l] + 1}, Append[l, l[[DivisorSigma[0, n]]] + l[[EulerPhi[n]]]]]; Nest[f, {0, 1}, 75] (*Chandler*)
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CROSSREFS
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Cf. A000005, A000010.
Sequence in context: A125568 A108872 A147847 this_sequence A089058 A080444 A082288
Adjacent sequences: A126971 A126972 A126973 this_sequence A126975 A126976 A126977
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet Mar 20 2007
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu) and Ray Chandler (rayjchandler(AT)sbcglobal.net), Mar 24 2007
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