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A138815
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Divisors of 16775168 (the 5th perfect number divided by 2).
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1
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| 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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LINKS
| Index entries for sequences related to divisors of numbers
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CROSSREFS
| Perfect number divided by 2: A133028. Cf. A000043, A000079, A000396, A000668, A090748, A134708, A135655, A138825.
Sequence in context: A131577 A171449 A050732 * A180212 A103662 A180211
Adjacent sequences: A138812 A138813 A138814 * A138816 A138817 A138818
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KEYWORD
| easy,fini,full,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Mar 31 2008
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