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Search: id:A104472
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| A104472 |
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Triangle of degree numbers for certain polynomials. |
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+0
2
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| 1, 2, 4, 3, 5, 8, 4, 8, 11, 15, 5, 9, 12, 16, 21, 6, 12, 18, 22, 27, 33, 7, 13, 19, 23, 28, 34, 41, 8, 16, 22, 30, 35, 41, 48, 56, 9, 17, 26, 34, 39, 45, 52, 60, 69, 10, 20, 29, 37, 47, 53, 60, 68, 77, 87, 11, 21, 30, 38, 48, 54, 61, 69, 78, 88, 99, 12, 24, 36, 48, 58, 70, 77, 85
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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This is the array ay(N,m)= A104471(n+m-1,m) with numbers m>N omitted because they are identical with ay(N,N).
a(n,m)=sum(j*floor(n/j),j=1..m), n>=m and zero else (but actually one should repeat the a(n,n) numbers for n<m).
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LINKS
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W. Lang: First 10 rows.
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EXAMPLE
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[1]; [2,4]; [3,5,8]; [4,8,11,15]; [5,9,12,16,21]; ...
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CROSSREFS
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Main diagonal a(n, n)= A024916(n), n>=1.
Sequence in context: A082006 A155850 A134464 this_sequence A132193 A091451 A082330
Adjacent sequences: A104469 A104470 A104471 this_sequence A104473 A104474 A104475
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KEYWORD
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nonn,easy,tabl
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang_AT_physik_DOT_uni-karlsruhe_DOT_de), Mar 24 2005
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