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Search: id:A002174
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| A002174 |
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Values taken by reduced totient function psi(n).
(Formerly M0986 N0370)
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+0
6
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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, 54, 56, 58, 60, 64, 66, 70, 72, 78, 80, 82, 84, 88, 90, 92, 96, 100, 102, 104, 106, 108, 110, 112, 116, 120, 126, 128, 130, 132, 136, 138, 140, 144, 148, 150, 156, 160, 162, 164, 166, 168
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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If p is a Sophie Germain prime (A005384), then 2p is here. [From T. D. Noe (noe(AT)sspectra.com), Aug 13 2008]
Union[A002322] = A002174. [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jul 21 2009]
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REFERENCES
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D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, pp. 7-10.
C. Moreau, Sur quelques theoremes d'arithmetique, Nouvelles Annales de Math\'{e}matiques, 17 (1898), 293-307.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..10000
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MATHEMATICA
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lst={}; Do[p=Prime[n]; AppendTo[lst, CarmichaelLambda[n]], {n, 6*7!}]; lst; Take[Union[lst], 123] [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jul 21 2009]
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CROSSREFS
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Cf. A002322.
A002396, A143407, A143408 [From T. D. Noe (noe(AT)sspectra.com), Aug 13 2008]
Sequence in context: A130261 A011860 A049445 this_sequence A002202 A049225 A076450
Adjacent sequences: A002171 A002172 A002173 this_sequence A002175 A002176 A002177
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KEYWORD
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nonn,nice
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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 T. D. Noe (noe(AT)sspectra.com), Aug 13 2008
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