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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
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.
LINKS
MATHEMATICA
Divisors[16775168] (* Wesley Ivan Hurt, Mar 20 2022 *)
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 A367654
KEYWORD
easy,fini,full,nonn
AUTHOR
Omar E. Pol, Mar 31 2008
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)