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A138814
Divisors of 4064 (half the 4th perfect number).
1
1, 2, 4, 8, 16, 32, 127, 254, 508, 1016, 2032, 4064
OFFSET
1,2
COMMENTS
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.
MATHEMATICA
Divisors[4064] (* Paolo Xausa, Jul 22 2024 *)
PROG
(PARI) divisors(4064) \\ Charles R Greathouse IV, Jun 21 2017
CROSSREFS
Perfect number divided by 2: A133028.
Sequence in context: A078227 A250073 A260873 * A233424 A137181 A272698
KEYWORD
easy,fini,full,nonn
AUTHOR
Omar E. Pol, Mar 31 2008
STATUS
approved