A138814 Divisors of 4064 (half the 4th perfect number).

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

Offset: 1

Author

Omar E. Pol, Mar 31 2008

Keywords

• easy
• fini
• full
• nonn

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.

Links

• Index entries for sequences related to divisors of numbers

Crossrefs

Perfect number divided by 2: A133028.

Cf. A000043, A000079, A000396, A000668, A090748, A134708, A135654, A138824.

Programs

Mathematica

Divisors[4064] (* Paolo Xausa, Jul 22 2024 *)

PARI

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