|
Search: id:A079598
|
|
| |
|
| 1, 28, 496, 8128, 130816, 2096128, 33550336, 536854528, 8589869056, 137438691328, 2199022206976, 35184367894528, 562949936644096, 9007199187632128, 144115187807420416, 2305843008139952128
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
A sequence rich in perfect numbers.
|
|
FORMULA
|
a(n+1) = 16*a(n) + 12*2^(2n).
a(n) = Sum_{k=1..2^n} (2*k-1)^3. - Franz Vrabec (franz.vrabec(AT)planetuniqa.at), Jun 24 2006
|
|
EXAMPLE
|
a(2) = 2^9 - 2^4 = 512 - 16 = 496
|
|
CROSSREFS
|
Cf. A006516.
Sequence in context: A028170 A076172 A004336 this_sequence A046999 A046986 A028145
Adjacent sequences: A079595 A079596 A079597 this_sequence A079599 A079600 A079601
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Marco Matosic (marcomatosic(AT)hotmail.com), Jan 28 2003
|
|
|
Search completed in 0.002 seconds
|
