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Search: id:A003271
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| A003271 |
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Smallest number which requires n iterations of the unitary totient function (A047994) to reach 1.
(Formerly M0531)
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+0
2
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| 1, 2, 3, 4, 5, 9, 16, 17, 41, 83, 113, 137, 257, 773, 977, 1657, 2048, 2313, 4001, 5725, 7129, 11117, 17279, 19897, 22409, 39283, 43657, 55457, 120677, 308941, 314521, 465089, 564353, 797931, 1110841, 1310443, 1924159, 2535041, 3637637, 6001937, 8319617, 9453569, 10969369
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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M. Lal, Iterates of the unitary totient function, Math. Comp., 28 (1974), 301-302.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
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Cf. A047994.
Sequence in context: A060732 A068584 A107799 this_sequence A049796 A106165 A088817
Adjacent sequences: A003268 A003269 A003270 this_sequence A003272 A003273 A003274
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from David W. Wilson (davidwwilson(AT)comcast.net)
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