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A127637
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Smallest squarefree triangular number with exactly n prime factors.
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2
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1, 3, 6, 66, 210, 3570, 207690, 930930, 56812470, 1803571770, 32395433070, 265257422430, 91348974206490, 24630635909489610, 438603767516904990, 14193386885746698630, 2378522762792139793830, 351206814022419685159830
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| The sequence of smallest squarefree triangular numbers with at least n prime factors has identical terms through 91348974206490 at least.
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EXAMPLE
| a(12) = 91348974206490 = 2*3*5*7*11*13*17*19*29*37*67*131 = A000217(13516580).
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CROSSREFS
| Cf. A075088, A076551, A005117, A000217.
Sequence in context: A137135 A069077 A076551 * A068665 A050722 A069502
Adjacent sequences: A127634 A127635 A127636 * A127638 A127639 A127640
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KEYWORD
| nonn
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AUTHOR
| Rick L. Shepherd (rshepherd2(AT)hotmail.com), Jan 28 2007, Feb 03 2007
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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
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