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Search: id:A002616
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| A002616 |
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Reduced totient function (divided by 2).
(Formerly M0128 N0052)
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+0
2
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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; listen)
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OFFSET
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3,3
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COMMENT
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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
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, pp. 7-10.
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LINKS
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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
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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
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Table[CarmichaelLambda[k + 2]/2, {k, 130}] - Artur Jasinski (grafix(AT)csl.pl), Apr 05 2008
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CROSSREFS
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Cf. A002322.
Cf. A002322.
Adjacent sequences: A002613 A002614 A002615 this_sequence A002617 A002618 A002619
Sequence in context: A014599 A075825 A007735 this_sequence A046073 A162912 A039776
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KEYWORD
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nonn,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 Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 04 2002
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