|
Search: id:A127637
|
|
|
| A127637 |
|
Smallest square-free triangular number with exactly n prime factors. |
|
+0
3
|
|
| 1, 3, 6, 66, 210, 3570, 207690, 930930, 56812470, 1803571770, 32395433070, 265257422430, 91348974206490, 24630635909489610, 438603767516904990, 14193386885746698630, 2378522762792139793830, 351206814022419685159830
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
The sequence of smallest square-free triangular numbers with at least n prime factors has identical terms through 91348974206490 at least.
|
|
EXAMPLE
|
a(12) = 91348974206490 = 2*3*5*7*11*13*17*19*29*37*67*131 = A000217(13516580).
|
|
CROSSREFS
|
Cf. A075088, A076551, A005117, A000217.
Sequence in context: A137135 A069077 A076551 this_sequence A068665 A050722 A069502
Adjacent sequences: A127634 A127635 A127636 this_sequence A127638 A127639 A127640
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Rick L. Shepherd (rshepherd2(AT)hotmail.com), Jan 28 2007, Feb 03 2007
|
|
EXTENSIONS
|
a(13)-a(16) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 28 2009
a(17) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 07 2009
|
|
|
Search completed in 0.002 seconds
|
