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Search: id:A079786
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| A079786 |
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Triangle read by rows in which the n-th row begins with n and contains tau(n) numbers. The r-th term from right is the largest number < n with r divisors, for 1<= r <= tau(n). |
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+0
2
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| 1, 2, 1, 3, 1, 4, 3, 1, 5, 1, 6, 4, 5, 1, 7, 1, 8, 4, 7, 1, 9, 7, 1, 10, 9, 7, 1, 11, 1, 12, 10, 9, 11, 1, 13, 1, 14, 9, 13, 1, 15, 9, 13, 1, 16, 15, 9, 13, 1, 17, 1, 18, 16, 15, 9, 17, 1, 19, 1, 20, 16, 15, 9, 19, 1, 21, 9, 19, 1, 22, 9, 19, 1, 23, 1, 24, 20, 16, 22, 9, 23, 1, 25, 23, 1, 26, 25
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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The number of terms in the n-th row = tau(n).
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EXAMPLE
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1
2 1
3 1
4 3 1
5 1
6 4 5 1
7 1
8 4 7 1
9 7 1
...
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PROGRAM
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(PARI) print(1, ", "); for(i=2, 50, v=[1]; for(j=2, sigma(i, 0), forstep(k=i, 1, -1, if(sigma(k, 0)==j, v=concat(v, k); break))); forstep(l=length(v), 1, -1, print1(v[l], ", ")); print()) - Lambert Herrgesell (zero815(AT)googlemail.com), Mar 13 2006
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CROSSREFS
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Cf. A079787.
Sequence in context: A113322 A007380 A029171 this_sequence A032451 A088445 A020653
Adjacent sequences: A079783 A079784 A079785 this_sequence A079787 A079788 A079789
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KEYWORD
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nonn,tabf
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 03 2003
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EXTENSIONS
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More terms from Lambert Herrgesell (zero815(AT)googlemail.com), Mar 13 2006
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