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A076302
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Triangle T(n,k) = number of k-smooth divisors of n, read by rows.
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0
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1, 1, 2, 1, 1, 2, 1, 3, 3, 3, 1, 1, 1, 1, 2, 1, 2, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 2, 1, 4, 4, 4, 4, 4, 4, 4, 1, 1, 3, 3, 3, 3, 3, 3, 3, 1, 2, 2, 2, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 3, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| T(n,n)=A000005(n);
T(n,2)=A001511(n) for n>1; T(n,3)=A072078(n) for n>2.
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LINKS
| Eric Weisstein's World of Mathematics, Divisor Function.
Eric Weisstein's World of Mathematics, Smooth Number.
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EXAMPLE
| Triangle begins:
.................. 1
................ 1...2
.............. 1...1...2
............ 1...3...3...3
.......... 1...1...1...1...2
........ 1...2...4...4...4...4
...... 1...1...1...1...1...1...2
.... 1...4...4...4...4...4...4...4
.. 1...1...3...3...3...3...3...3...3.
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CROSSREFS
| Sequence in context: A088428 A025838 A105248 * A104524 A128807 A071628
Adjacent sequences: A076299 A076300 A076301 * A076303 A076304 A076305
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KEYWORD
| nonn,tabl
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 14 2003
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