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Search: id:A065155
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| A065155 |
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Cototient-of-totient > totient-of-cototient. |
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+0
1
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| 5, 7, 9, 11, 13, 17, 19, 21, 22, 23, 25, 26, 27, 29, 31, 34, 35, 37, 38, 39, 41, 43, 44, 45, 46, 47, 49, 50, 52, 53, 55, 57, 58, 59, 61, 62, 63, 65, 67, 68, 69, 71, 73, 74, 76, 77, 79, 81, 82, 83, 85, 86, 87, 88, 89, 91, 92, 93, 94, 95, 97, 98, 99, 100, 101, 103, 104, 106
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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Primes except 2 and 3 are here. E.g. p=101, Phi[101]=100,Cototient[101]=1, Phi[1]=1<Cototient[100]=40.
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MATHEMATICA
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Flatten[Position[Sign[t], 1]], where t=Table[co[eu[w]]-eu[co[w]], {w, 1, 256}] and eu[x_] := EulerPhi[x]; co[x_] := x-EulerPhi[x]
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PROGRAM
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(PARI) { n=0; for (m = 2, 10^9, t=eulerphi(m); c=m - t; if (t - eulerphi(t) > eulerphi(c), write("b065155.txt", n++, " ", m); if (n==1000, return)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 13 2009]
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CROSSREFS
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Cf. A000010, A051953, A065152-A065154.
Sequence in context: A031102 A005763 A035034 this_sequence A088502 A081001 A075025
Adjacent sequences: A065152 A065153 A065154 this_sequence A065156 A065157 A065158
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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), Oct 19 2001
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