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A336334
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Decimal expansion of Sum_{n>=1} phi(n)/n!, where phi(n) is the Euler totient function A000010.
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2
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1, 9, 5, 4, 0, 8, 5, 3, 5, 7, 8, 7, 6, 0, 0, 6, 2, 1, 3, 1, 4, 4, 5, 9, 4, 8, 6, 1, 1, 4, 7, 1, 4, 9, 5, 4, 0, 3, 7, 0, 6, 7, 2, 7, 7, 0, 1, 8, 6, 9, 6, 1, 0, 6, 0, 8, 2, 9, 8, 7, 7, 7, 2, 0, 7, 8, 8, 7, 0, 8, 7, 9, 8, 5, 5, 2, 7, 6, 0, 9, 2, 3, 7, 9, 0
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OFFSET
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1,2
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COMMENTS
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The following comment is provided in A000010: Sum_{n>=1} a(n)/n! = 1.954085357876006213144... This sum is referenced in Plouffe's inverter. - Alexander R. Povolotsky, Feb 02 2013
This constant is irrational (Erdős and Straus, 1974). - Amiram Eldar, Jul 04 2021
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LINKS
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EXAMPLE
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1.9540853578760062131445948611471495403706727701869610608298777207887...
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PROG
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(PARI) suminf(k=1, eulerphi(k)/k!)
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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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