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Search: id:A078157
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| 0, 0, 0, 2, 4, 8, 13, 22, 34, 52, 77, 114, 166, 240, 345, 494, 705, 1004, 1427, 2026, 2873, 4072, 5767, 8166, 11558
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OFFSET
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1,4
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MATHEMATICA
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Table[ Length[ Union[ Table[ Floor[2^w/j], {j, 1, 2^w}]]] - DivisorSigma[0, 2^w], {w, 1, 25}]
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CROSSREFS
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Cf. A078152, A078153, A078154, A078155, A078156 & A078158.
Sequence in context: A046185 A073336 A134035 this_sequence A144119 A023600 A074467
Adjacent sequences: A078154 A078155 A078156 this_sequence A078158 A078159 A078160
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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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EXTENSIONS
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Extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 02 2002
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