

A138815


Divisors of 16775168 (half the 5th perfect number).


1



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

1,2


COMMENTS

The nth 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.


LINKS

Table of n, a(n) for n=1..24.
Index entries for sequences related to divisors of numbers


PROG

(PARI) divisors(16775168) \\ Charles R Greathouse IV, Jun 22 2017


CROSSREFS

Perfect number divided by 2: A133028. Cf. A000043, A000079, A000396, A000668, A090748, A134708, A135655, A138825.
Sequence in context: A260814 A274864 A274863 * A275077 A275065 A180212
Adjacent sequences: A138812 A138813 A138814 * A138816 A138817 A138818


KEYWORD

easy,fini,full,nonn


AUTHOR

Omar E. Pol, Mar 31 2008


STATUS

approved



