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Search: id:A048166
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| A048166 |
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n is divisible by the number of unitary divisors of n (A034444). |
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+0
6
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| 1, 2, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 64, 68, 72, 76, 80, 88, 92, 96, 100, 104, 108, 112, 116, 120, 124, 128, 136, 144, 148, 152, 160, 164, 168, 172, 176, 184, 188, 192, 196, 200, 208, 212, 216, 224, 232, 236, 240, 244, 248, 256, 264, 268
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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Binomial transform of [1, 1, 1, 1, -3, 5, -7, 9, -11, 13,...]. Binomial transform of this sequence = A048481: (1, 3, 9, 27, 77, 207, 529,...). - Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 23 2007
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EXAMPLE
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a[ 81 ]=392=2^3*7^2 has 4 unitary divisors: {1,392,8,49} and 4 divides 392.
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CROSSREFS
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A033950, A034444, A000005, A048167.
Cf. A048481.
Sequence in context: A050865 A124395 A024908 this_sequence A010066 A006638 A001212
Adjacent sequences: A048163 A048164 A048165 this_sequence A048167 A048168 A048169
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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)
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