|
| |
|
|
A133025
|
|
Divisors of 33550336, the 5th perfect number.
|
|
5
| |
|
|
1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8191, 16382, 32764, 65528, 131056, 262112, 524224, 1048448, 2096896, 4193792, 8387584, 16775168, 33550336
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| 8191 is the 5th Mersenne prime: A000668.
The number of divisors of the 5th perfect number is 2*A000043(5)=A061645(5)=26.
For the structure of this sequence and its binary expansion, see A135655.
|
|
|
LINKS
| Index entries for sequences related to divisors of numbers
O. E. Pol, Determinacion geometrica de los numeros primos y perfectos.
|
|
|
FORMULA
| For n=1..13 : a(n) = 2^(n-1). For n=14..26: a(n) = 2^(n-1) - 2^(n-14) = A000668(5)*2^(n-14).
|
|
|
CROSSREFS
| Cf. A018254, A018487. Perfect numbers: A000396.
Cf. A000043, A000079, A000668, A061645, A133033, A135655.
Sequence in context: A168082 A168083 A168084 * A190126 A118655 A155559
Adjacent sequences: A133022 A133023 A133024 * A133026 A133027 A133028
|
|
|
KEYWORD
| fini,full,nonn,easy
|
|
|
AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Oct 26 2007, Mar 03 2008, Dec 27 2008
|
| |
|
|
