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A297382
Denominator of -A023900(n)/2.
2
2, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
OFFSET
1,1
COMMENTS
Also denominator of A173557(n)/2. a(n) = 2 iff n is a power of 2, 1 otherwise. - Antti Karttunen, Sep 30 2018
LINKS
FORMULA
a(n) = denominator of -A023900(n)/2.
a(n) = 1 + A209229(n). - Antti Karttunen, Sep 30 2018
MATHEMATICA
Clear[n, s, nn]; nn = 64; Denominator[Table[Limit[Zeta[s]*Total[MoebiusMu[Divisors[n]]/Divisors[n]^(s - 1)], s -> 0], {n, 1, nn}]]
PROG
(PARI) A297382(n) = denominator(-(1/2)*factorback(apply(p -> 1-p, factor(n)[, 1]))); \\ Antti Karttunen, Sep 30 2018
CROSSREFS
Cf. A297381 (numerators).
One more than A209229.
Sequence in context: A137454 A092984 A338428 * A258257 A086600 A218450
KEYWORD
nonn,frac
AUTHOR
Mats Granvik, Dec 29 2017
EXTENSIONS
More terms from Antti Karttunen, Sep 30 2018
STATUS
approved