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A019297
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Integers k such that abs(e^(Pi*sqrt(n)) - k) < 0.01 for some n.
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6
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-1, 1, 2198, 422151, 614552, 2508952, 6635624, 199148648, 884736744, 24591257752, 30197683487, 147197952744, 545518122090, 70292286279654, 39660184000219160, 45116546012289600, 262537412640768744
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OFFSET
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0,3
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COMMENTS
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Old name of sequence was "Integers that are very close to values of exp(Pi*sqrt(n))", which left "very close" undefined. Robert G. Wilson v resolved this problem on Feb 28 2006 with the comment that "'Very close' means to within 0.01." - Jon E. Schoenfield, Mar 21 2015
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REFERENCES
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H. M. Stark, An Introduction to Number Theory. Markham, Chicago, 1970, p. 179.
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LINKS
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EXAMPLE
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e^(Pi*sqrt(163)) = 262537412640768743.99999999999925007259719818568887935385...
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MATHEMATICA
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f[n_] := Block[{e = Exp[Pi*Sqrt[n]]}, Abs[e - Round[e]]]; Round @ Exp[Pi*Sqrt @ Select[Range[ -1, 200], f @ # < 10^(-2) &]] (* Robert G. Wilson v, Feb 28 2006 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Roy Williams Clickery (roy(AT)ccsf.caltech.edu)
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EXTENSIONS
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STATUS
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approved
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