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A073744
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Decimal expansion of tanh(1).
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14
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7, 6, 1, 5, 9, 4, 1, 5, 5, 9, 5, 5, 7, 6, 4, 8, 8, 8, 1, 1, 9, 4, 5, 8, 2, 8, 2, 6, 0, 4, 7, 9, 3, 5, 9, 0, 4, 1, 2, 7, 6, 8, 5, 9, 7, 2, 5, 7, 9, 3, 6, 5, 5, 1, 5, 9, 6, 8, 1, 0, 5, 0, 0, 1, 2, 1, 9, 5, 3, 2, 4, 4, 5, 7, 6, 6, 3, 8, 4, 8, 3, 4, 5, 8, 9, 4, 7, 5, 2, 1, 6, 7, 3, 6, 7, 6, 7, 1, 4, 4, 2, 1, 9, 0
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OFFSET
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0,1
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COMMENTS
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tanh(x) = (e^x - e^(-x)) / (e^x + e^(-x)).
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REFERENCES
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S. Selby, editor, CRC Basic Mathematical Tables, CRC Press, 1970, p. 218.
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LINKS
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FORMULA
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Equals Sum_{k>=1} bernoulli(2*k)*2^(2*k)*(2^(2*k)-1)/(2*k)!, where bernoulli(k) = A027641(k)/A027642(k) is the k-th Bernoulli number. - Amiram Eldar, Aug 19 2020
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EXAMPLE
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0.76159415595576488811945828260...
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MATHEMATICA
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RealDigits[Tanh[1], 10, 100][[1]] (* Amiram Eldar, Aug 19 2020 *)
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PROG
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(PARI) tanh(1)
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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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