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Search: id:A067843
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| A067843 |
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Least solution k of phi(k-n)+phi(k+n)=phi(2k). |
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+0
1
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| 5, 10, 7, 10, 11, 12, 35, 14, 13, 22, 55, 22, 19, 70, 19, 22, 85, 26, 77, 26, 27, 110, 55, 34, 55, 38, 31, 34, 119, 38, 65, 44, 41, 52, 65, 46, 185, 154, 43, 46
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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k = 10 is the smallest solution of phi(k-2)+phi(k+2)=phi(2k). So a(2) = 10.
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MATHEMATICA
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f[k_] := Module[{i = k + 1}, While[EulerPhi[i - k] + EulerPhi[i + k] != EulerPhi[2 i], i++ ]; i]; Table[f[n], {n, 1, 40}]
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CROSSREFS
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Cf. A067701.
Sequence in context: A005093 A103697 A104645 this_sequence A109360 A141622 A144136
Adjacent sequences: A067840 A067841 A067842 this_sequence A067844 A067845 A067846
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KEYWORD
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nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Feb 11 2002
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