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A138814
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Divisors of 4064 (half the 4th perfect number).
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1
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1, 2, 4, 8, 16, 32, 127, 254, 508, 1016, 2032, 4064
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OFFSET
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1,2
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COMMENTS
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The n-th perfect number divided by 2 (A133028(n)) has 2*A090748(n) divisors, then this sequence has 12 members. First 6 members are the first 6 powers of 2 A000079. Last 6 members are multiples of 4th Mersenne prime A000668(4)=127. a(n) written in base 2 has n digit. See A138824 for the structure of this sequence.
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LINKS
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Table of n, a(n) for n=1..12.
Index entries for sequences related to divisors of numbers
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PROG
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(PARI) divisors(4064) \\ Charles R Greathouse IV, Jun 21 2017
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CROSSREFS
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Perfect number divided by 2: A133028. Cf. A000043, A000079, A000396, A000668, A090748, A134708, A135654, A138824.
Sequence in context: A078227 A250073 A260873 * A233424 A137181 A272698
Adjacent sequences: A138811 A138812 A138813 * A138815 A138816 A138817
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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, Mar 31 2008
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STATUS
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approved
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