|
Search: id:A135060
|
|
|
| A135060 |
|
a(n) = smallest number m for which none of the first n multiples of m has twice as many divisors as m. |
|
+0
5
|
| |
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
a(n) is smallest value m where A129902(m)/m >= n.
Conjecture: every number in this sequence is also in A002182. Comment from J. Lowell (jhbubby(AT)mindspring.com), Jun 06 2008: The conjecture that every term is a multiple of the preceding term is disproved at n = 15; a(15) = 1081080, which is not a multiple of 720720.
|
|
EXAMPLE
|
60 does not qualify for a(6) because 60 has 12 divisors and 60*6=360 has 12*2=24 divisors
|
|
CROSSREFS
|
Adjacent sequences: A135057 A135058 A135059 this_sequence A135061 A135062 A135063
Sequence in context: A126915 A002201 A004490 this_sequence A072486 A096123 A081125
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
J. Lowell (jhbubby(AT)mindspring.com), Feb 11 2008, Jul 08 2008, Jul 14 2008
|
|
|
Search completed in 0.002 seconds
|
