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Search: id:A049225
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| A049225 |
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Values of totient function applied to square-free numbers; or numbers of form Product (p_i-1) where p_i are distinct primes. |
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1
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| 1, 2, 4, 6, 8, 10, 12, 16, 18, 20, 22, 24, 28, 30, 32, 36, 40, 42, 44, 46, 48, 52, 56, 58, 60, 64, 66, 70, 72, 78, 80, 82, 84, 88, 92, 96, 100, 102, 104, 106, 108, 112, 116, 120, 126, 128, 130, 132, 136, 138, 140, 144, 148, 150, 156, 160, 162, 164, 166, 168, 172, 176
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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EulerPhi[ x ] when Abs[ mu[ x ] ]=1, then the sequence is ordered by magnitude.
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EXAMPLE
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8,120,48 are here as totient functions of square-free numbers 15,143,210. 54 and 110,294,342 are missing since not EulerPhi value of any square-free numbers.
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CROSSREFS
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Terms of A049200 after ordering and omitting multiple occurrences.
Cf. A000010, A005117, A013929, A002174, A002202, A049200.
Adjacent sequences: A049222 A049223 A049224 this_sequence A049226 A049227 A049228
Sequence in context: A049445 A002174 A002202 this_sequence A076450 A097379 A114871
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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)
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