|
Search: id:A154882
|
|
|
| A154882 |
|
a(n) = smallest number with at least as many divisors as (a(n-1))^2 |
|
+0
1
|
|
| 2, 4, 12, 120, 7560, 8648640, 1927522396800, 4747472432036420486400, 128438082648984172330026178330296384000, 6184173455628205993842062057864303743050691444602955105860128640000
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
FORMULA
|
a(n)=A061799(A048691(a(n-1))). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 21 2009]
|
|
EXAMPLE
|
4^2 = 16 with 5 divisors; smallest number with at least 5 divisors is 12
|
|
CROSSREFS
|
Sequence in context: A038791 A001696 A013333 this_sequence A062000 A053040 A154734
Adjacent sequences: A154879 A154880 A154881 this_sequence A154883 A154884 A154885
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
J. Lowell (jhbubby(AT)mindspring.com), Jan 16 2009
|
|
EXTENSIONS
|
a(6)-a(10) from Donovan Johnson (donovan.johnson(AT)yahoo.com), May 09 2009
|
|
|
Search completed in 0.002 seconds
|
