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Search: id:A138815
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| A138815 |
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Divisors of 16775168 (the 5th perfect number divided by 2). |
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+0
2
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| 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 8191, 16382, 32764, 65528, 131056, 262112, 524224, 1048448, 2096896, 4193792, 8387584, 16775168
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OFFSET
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1,2
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COMMENT
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The n-th perfect number divided by 2 (A133028(n)) has 2*A090748(n) divisors, then this sequence has 24 members. First 12 members are the first 12 powers of 2 A000079. Last 12 members are multiples of 5th Mersenne prime A000668(5)=8191. a(n) written in base 2 has n digits. See A138825 for the structure of this sequence.
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CROSSREFS
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Perfect number divided by 2: A133028. Cf. A000043, A000079, A000396, A000668, A090748, A134708, A135655, A138825.
Adjacent sequences: A138812 A138813 A138814 this_sequence A138816 A138817 A138818
Sequence in context: A000079 A120617 A050732 this_sequence A103662 A023423 A079838
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KEYWORD
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easy,fini,full,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Mar 31 2008
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