

A138814


Divisors of 4064 (half the 4th perfect number).


1



1, 2, 4, 8, 16, 32, 127, 254, 508, 1016, 2032, 4064
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OFFSET

1,2


COMMENTS

The nth 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.


LINKS

Table of n, a(n) for n=1..12.
Index entries for sequences related to divisors of numbers


PROG

(PARI) divisors(4064) \\ Charles R Greathouse IV, Jun 21 2017


CROSSREFS

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


KEYWORD

easy,fini,full,nonn


AUTHOR

Omar E. Pol, Mar 31 2008


STATUS

approved



