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A364806
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Decimal expansion of 1/(Re((-sqrt(2))^^9) - 1), where ^^ indicates tetration.
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2
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2, 0, 0, 2, 3, 3, 2, 6, 1, 1, 1, 6, 7, 5, 5, 7, 8, 4, 2, 6, 6, 7, 9, 7, 2, 0, 7, 1, 0, 8, 3, 0, 2, 9, 9, 7, 8, 1, 4, 5, 9, 3, 2, 6, 6, 8, 2, 9, 3, 4, 5, 1, 5, 3, 3, 2, 6, 3, 3, 5, 4, 8, 9, 9, 3, 7, 4, 8, 6, 4, 3, 0, 3, 6, 2, 1, 4, 6, 3, 7, 0, 7, 8, 4, 1, 1, 9
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OFFSET
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45,1
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COMMENTS
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For a detailed explanation of the fact that Re((-sqrt(2))^^9) is surprisingly close to 1, because Re((-sqrt(2))^^8) is small at about 6.491878...*10^-46, see Links (i.e., the answer provided by the MathOverflow user Saúl RM).
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LINKS
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FORMULA
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Equals 1/(Re((-sqrt(2))^(-sqrt(2))^(-sqrt(2))^(-sqrt(2))^(-sqrt(2))^(-sqrt(2))^(-sqrt(2))^(-sqrt(2))^(-sqrt(2))) - 1).
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EXAMPLE
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200233261116755784266797207108302997814593266.829345153326335489937486...
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MAPLE
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Digits:=100: 1: for i from 1 to 9 do (-sqrt(2))^% end do: printf("%.55f", 1/Re(evalf[150](%-1))); # Michal Paulovic, Aug 20 2023
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MATHEMATICA
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x=1; Do[x=(-Sqrt[2])^x, {9}]; x=1/Re[N[x-1, 100]]; RealDigits[x, 10, 100][[1]] (* Michal Paulovic, Aug 20 2023 *)
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PROG
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(PARI) default(realprecision, 100); x=1; for(i=1, 9, x=(-sqrt(2))^x); 1/real(x-1) \\ Michal Paulovic, Aug 20 2023
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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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