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A126576
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a(n) = denominator of the sum of reciprocals of the terms in n-th row of triangle A126571.
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1
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1, 6, 60, 140, 630, 31416, 34580, 91080, 1093950, 58549260, 6702696, 61910940, 2379795600, 1197892080, 21742542360, 21741799002768, 143830236550, 2559047531040, 38886283310, 333903908520, 24063048428483064
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OFFSET
| 1,2
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EXAMPLE
| Row 4 of triangle A126571 is (4,7,5,7).
So a(4) is the denominator of 1/4 +1/7 +1/5 + 1/7 = 103/84.
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MATHEMATICA
| f[m_, n_] := Block[{k = 0, c = n}, While[c > 0, k++; While[GCD[k, m] > 1, k++ ]; c--; ]; k]; Table[Denominator@Sum[1/f[m, n], {m, n}], {n, 22}] (*Chandler*)
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CROSSREFS
| Cf. A126571, A126575.
Sequence in context: A002827 A137498 A036283 * A121287 A069072 A074441
Adjacent sequences: A126573 A126574 A126575 * A126577 A126578 A126579
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KEYWORD
| frac,nonn
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AUTHOR
| Leroy Quet Dec 28 2006
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EXTENSIONS
| Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 29 2006
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