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A073644 Largest k such that the harmonic mean of phi(n), phi(n+1), ...., phi(n+x) is an integer for any x with 0<=x<=k. 0
1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 2, 3, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,12

COMMENTS

Largest k such that (x+1)/sum(i=0,x,1/phi(n+i)) is an integer for 0<=x<=k. It seems that a(n)<=5.

LINKS

Table of n, a(n) for n=1..105.

CROSSREFS

Sequence in context: A063890 A156439 A087734 * A123343 A054439 A318656

Adjacent sequences:  A073641 A073642 A073643 * A073645 A073646 A073647

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Sep 01 2002

STATUS

approved

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Last modified November 17 16:08 EST 2019. Contains 329241 sequences. (Running on oeis4.)