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Search: id:A095705
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| A095705 |
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Triangular array read by rows: a(n, k) = sum of number of ordered factorizations of all prime signatures with n total prime factors and k distinct prime factors. |
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+0
6
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| 1, 2, 3, 4, 8, 13, 8, 46, 44, 75, 16, 124, 308, 308, 541, 32, 572, 1790, 2536, 2612, 4683, 64, 1568, 8352, 17028, 24704, 25988, 47293, 128, 6728, 40628, 137498, 187928, 277456, 296564, 545835, 256, 18768, 228308, 719056, 1699184, 2356560, 3526448
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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A093936 is an analogous array for unordered factorizations.
First column is A000079. First two diagonals are A000670 and A005649.
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EXAMPLE
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There are two prime signatures with 5 total primes and 3 distinct primes: p^3*q*r and p^2*q^2*r. A074206(p^3*q*r) = 132 and A074206(p^2*q^2*r) = 176, so a(5, 3) = 132+176 = 308.
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CROSSREFS
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A035341 gives the row sums. Cf. A050324, A074206, A093936, A096443.
Adjacent sequences: A095702 A095703 A095704 this_sequence A095706 A095707 A095708
Sequence in context: A060984 A098348 A131420 this_sequence A034776 A068791 A126042
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KEYWORD
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nonn,tabl
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AUTHOR
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Alford Arnold (Alford1940(AT)aol.com), Jul 04 2004, Nov 22 2005
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EXTENSIONS
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Edited and extended by David Wasserman (dwasserm(AT)earthlink.net), Feb 22 2008
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