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Search: id:A078153
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| 0, 0, 0, 0, 2, 0, 5, 0, 6, 3, 10, 0, 15, 7, 9, 8, 22, 4, 24, 9, 21, 19, 32, 0, 35, 26, 30, 17, 44, 11, 52, 24, 41, 37, 45, 12, 66, 46, 52, 22, 71, 27, 80, 43, 52, 60, 85, 14, 89, 56, 79, 56, 101, 39, 89, 52, 94, 86, 117, 15, 122, 90, 85, 73, 118, 62, 139, 84, 116, 72, 145, 36
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OFFSET
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1,5
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EXAMPLE
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n=15: sequence of D1={Floor[15/j]}={15,7,5,3,3,2,2,1,1,1,1,1,1,1,1}, Union[D1]={15,7,5,3,2,1}=Divisors[15]and{7,2}, a[15]=(15+7+5+3+2+1)-sigma[15]=7+2=9.
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MATHEMATICA
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Table[Apply[Plus, Union[Table[Floor[w/j], {j, 1, w}]]] -DivisorSigma[1, w], {w, 1, 128}]
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CROSSREFS
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Cf. A051201, A000203, A055086, A000005, A078152, A076891.
Sequence in context: A104755 A054013 A048050 this_sequence A104035 A115333 A105523
Adjacent sequences: A078150 A078151 A078152 this_sequence A078154 A078155 A078156
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Nov 27 2002
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