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75. sequence is: 10 x3=30 /2=15 +1=16 x3=48 /2=24 +1=25 x3=75

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Alternatively, rather than three intertwined sequences, try the single sequence

t(n) = (140n6 - 3105n5 + 26525n4 - 109875n3 + 228185n2 - 219870n + 81000)/300 for n = 1, 2, 3, ...

This gives t(8) = 906

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12y ago

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