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Search: id:A145190
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A145190 Numbers n such that phi(1)*phi(2)*...*phi(n) / n is an integer, where phi(i) is the totient function (A000010). +0
1
1, 4, 8, 9, 12, 15, 16, 18, 20 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Cf. A048290, A000010, A144857

Sequence in context: A078136 A037973 A044844 this_sequence A004753 A144794 A047462

Adjacent sequences: A145187 A145188 A145189 this_sequence A145191 A145192 A145193

KEYWORD

easy,nonn

AUTHOR

Ctibor O. Zizka (c.zizka(AT)email.cz), Oct 03 2008

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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