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A125605
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Triangle read by rows: T(n,k) = (T(n-1,k-1) + T(n-1,k)) / gcd(T(n-1,k-1), T(n-1,k)).
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4
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1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 2, 4, 1, 1, 5, 3, 3, 5, 1, 1, 6, 8, 2, 8, 6, 1, 1, 7, 7, 5, 5, 7, 7, 1, 1, 8, 2, 12, 2, 12, 2, 8, 1, 1, 9, 5, 7, 7, 7, 7, 5, 9, 1, 1, 10, 14, 12, 2, 2, 2, 12, 14, 10, 1, 1, 11, 12, 13, 7, 2, 2, 7, 13, 12, 11, 1, 1, 12, 23, 25, 20, 9, 2, 9, 20, 25, 23, 12, 1, 1, 13
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,5
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COMMENTS
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LINKS
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PROG
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(Haskell)
a125605 n k = a125605_tabl !! n !! k
a125605_row n = a125605_tabl !! n
a125605_tabl = iterate f [1] where
f xs = zipWith (\v w -> (v + w) `div` gcd v w) ([0] ++ xs) (xs ++ [0])
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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