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A356022
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Decimal expansion of the infinite series Sum_{j=0..oo} 1/2^^j where ^^ indicates tetration.
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2
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1, 8, 1, 2, 5, 1, 5, 2, 5, 8, 7, 8, 9, 0, 6, 2, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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OFFSET
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1,2
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COMMENTS
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This constant converges very fast to a finite value around 118785/65536, since tetration (AKA hyper-4) makes 2^^k become very big so quickly, even for "relatively small" values of k (e.g., 1/2^^5 < 1/10^19728.30).
This sequence has been inspired by a question posted by the user Max Muller on MathOverflow on July 2022 (see Links).
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LINKS
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FORMULA
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EXAMPLE
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1.812515258789...
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MATHEMATICA
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RealDigits[Total[1/NestList[2^# &, 1, 5]], 10, 100][[1]] (* Amiram Eldar, Jul 23 2022 *)
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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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