|
Search: id:A072486
|
|
|
| A072486 |
|
a(1) =1, a(n) = a(n-1) times smallest divisor of n other than 1. |
|
+0
3
|
|
| 1, 2, 6, 12, 60, 120, 840, 1680, 5040, 10080, 110880, 221760, 2882880, 5765760, 17297280, 34594560, 588107520, 1176215040, 22348085760, 44696171520, 134088514560, 268177029120, 6168071669760, 12336143339520, 61680716697600
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
a(n) = product of the smallest divisors > 1 of all the numbers from 2 to n.
|
|
EXAMPLE
|
a(5) = 60. a(6) = 1*2*3*2*5*2 = 120 Also a(6) = a(5) * 2 =120
|
|
CROSSREFS
|
Sequence in context: A002201 A004490 A135060 this_sequence A096123 A081125 A138570
Adjacent sequences: A072483 A072484 A072485 this_sequence A072487 A072488 A072489
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 13 2002
|
|
EXTENSIONS
|
More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 25 2003
|
|
|
Search completed in 0.002 seconds
|
