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A276498
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Number of trials T of an event that occurs with probability 1-1/n that must be repeated consecutively so that the probability that the event occurs on all T trials (i.e., (1-1/n)^T) is minimally higher than 1/n.
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1
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1, 3, 5, 7, 10, 13, 16, 19, 22, 25, 29, 32, 36, 39, 43, 47, 51, 54, 58, 62, 66, 71, 75, 79, 83, 87, 92, 96, 100, 105, 109, 114, 118, 123, 127, 132, 136, 141, 146, 150, 155, 160, 165, 169, 174, 179, 184, 189, 194, 199, 203, 208, 213, 218, 223, 228, 233
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OFFSET
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2,2
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LINKS
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FORMULA
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a(n) = round(log(1/n)/log(1-1/n)).
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EXAMPLE
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a(20) = round(log(1/20)/log(1-1/20)) = round(log(0.05)/log(0.95)) = round(58.4...) = 58.
If a phenomenon P occurs with a 95% probability on any given trial, how many trials T must be performed so that the probability that P occurs on all T trials reduces to 5%? 0.95^T = 0.05 => T = log(0.05)/log(0.95) = 58.4... = 58 (rounded).
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MATHEMATICA
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PROG
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(PARI) a(n) = round (log(1/n)/log(1-1/n)); \\ Michel Marcus, Sep 05 2016
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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