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A002616
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Reduced totient function (divided by 2).
(Formerly M0128 N0052)
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1
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1, 1, 2, 1, 3, 1, 3, 2, 5, 1, 6, 3, 2, 2, 8, 3, 9, 2, 3, 5, 11, 1, 10, 6, 9, 3, 14, 2, 15, 4, 5, 8, 6, 3, 18, 9, 6, 2, 20, 3, 21, 5, 6, 11, 23, 2, 21, 10, 8, 6, 26, 9, 10, 3, 9, 14, 29, 2, 30, 15, 3, 8, 6, 5, 33, 8, 11, 6, 35, 3, 36, 18, 10, 9, 15, 6, 39, 2, 27, 20, 41, 3, 8, 21, 14, 5, 44, 6, 6
(list; graph; refs; listen; history; internal format)
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OFFSET
| 3,3
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COMMENTS
| A046073 is a similar sequence (the first difference occurs at position 61) - Artur Jasinski (grafix(AT)csl.pl), Apr 05 2008
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REFERENCES
| D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, pp. 7-10.
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
| A. Cauchy, Memoire sur la resolution des equations indeterminees du premier degre en nombres entiers, Oeuvres Compl\`{e}tes. Gauthier-Villars, Paris, 1882-1938, Series (2), Vol. 12, pp. 9-47.
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FORMULA
| Half of the Carmichael Lambda function: a(n)=[Carmichael Lambda function(n+2)]/2 - Artur Jasinski (grafix(AT)csl.pl), Apr 05 2008
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MATHEMATICA
| Table[CarmichaelLambda[k + 2]/2, {k, 130}] - Artur Jasinski (grafix(AT)csl.pl), Apr 05 2008
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CROSSREFS
| Cf. A002322.
Sequence in context: A014599 A075825 A007735 * A046073 A162912 A039776
Adjacent sequences: A002613 A002614 A002615 * A002617 A002618 A002619
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 04 2002
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