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Search: id:A133477
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| A133477 |
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Sum of cube-free divisors of n excluding 1. |
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+0
1
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| 0, 2, 3, 6, 5, 11, 7, 6, 12, 17, 11, 27, 13, 23, 23, 6, 17, 38, 19, 41, 31, 35, 23, 27, 30, 41, 12, 55, 29, 71, 31, 6, 47, 53, 47, 90, 37, 59, 55, 41, 41, 95, 43, 83, 77, 71, 47, 27, 56, 92, 71, 97, 53, 38, 71, 55, 79, 89, 59, 167, 61, 95, 103, 6, 83, 143, 67, 125, 95, 143, 71, 90
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Matthew M. Conroy, Home Page, listed in lieu of email address.
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FORMULA
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Equals A073185(n) - 1. - N. J. A. Sloane (njas(AT)research.att.com), Nov 30 2007
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EXAMPLE
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a(8) = 6 because the divisors of 8 are {1,2,4,8}, the cube-free divisors are 1, 2, 4 so we get a(8) = 2 + 4 = 6.
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CROSSREFS
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Cf. A004709, A005117, A039653, A048250, A068318, A083681.
Cf. A073184, A073185.
Sequence in context: A073740 A077320 A019565 this_sequence A039653 A106379 A001634
Adjacent sequences: A133474 A133475 A133476 this_sequence A133478 A133479 A133480
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Nov 29 2007
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Nov 30 2007
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl) and Matthew M. Conroy, Jan 08 2008
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