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If ''n'' is prime, then μ(''n'') = −1, but the converse is not true. The first non prime ''n'' for which μ(''n'') = −1 is 30 = 2·3·5. The first such numbers with 3 distinct prime factors ([[sphenic number]]s) are ([[OEIS:A007304]]):
30, 42, 66, 70, 78, 102, 105, 110, 114, 130, 138, 154,
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