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Search: id:A131781
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| 1, 3, 1, 1, 3, 1, 3, 3, 3, 1, 1, 5, 5, 3, 1, 3, 5, 7, 7, 3, 1, 1, 7, 11, 9, 9, 3, 1, 3, 7, 13, 19, 11, 11, 3, 1, 1, 9, 19, 21, 29, 13, 13, 3, 1, 3, 9, 21, 39, 31, 41, 15, 15, 3, 1
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = A131780: (1, 4, 5, 10, 15, 26, 41,...), a sequence with a(n)/a(n-1) tending to phi. A131779 is a companion triangle, same row sums.
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FORMULA
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2*A046854 - A000012(signed by columns + - + -,...).
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EXAMPLE
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First few rows of the triangle are:
1;
3, 1;
1, 3, 1;
3, 3, 3, 1;
1, 5, 5, 3, 1;
3, 5, 7, 7, 3, 1;
1, 7, 11, 9, 9, 3, 1;
3, 7, 13, 19, 11, 11, 3, 1;
...
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CROSSREFS
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Cf. A131779, A131780, A046854, A000012.
Sequence in context: A131779 A131775 A035691 this_sequence A082465 A131327 A122506
Adjacent sequences: A131778 A131779 A131780 this_sequence A131782 A131783 A131784
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 14 2007
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