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A046666
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n-(smallest prime dividing n).
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4
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0, 0, 2, 0, 4, 0, 6, 6, 8, 0, 10, 0, 12, 12, 14, 0, 16, 0, 18, 18, 20, 0, 22, 20, 24, 24, 26, 0, 28, 0, 30, 30, 32, 30, 34, 0, 36, 36, 38, 0, 40, 0, 42, 42, 44, 0, 46, 42, 48, 48, 50, 0, 52, 50, 54, 54, 56, 0, 58, 0, 60, 60, 62, 60, 64, 0, 66, 66, 68, 0, 70, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,3
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COMMENTS
| Contribution from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 08 2010: (Start)
a(n)=0 iff n is not composite;
for composite n: a(n) = MAX(m: m < n and GCD(m,n) > 1). (End)
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MATHEMATICA
| Table[n-First@(First/@FactorInteger[n]), {n, 2, 200}] (*From Vladimir Joseph Stephan Orlovsky, Apr 8 2011*)
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CROSSREFS
| Cf. A061228.
Sequence in context: A130891 A091371 A144775 * A176296 A131575 A077957
Adjacent sequences: A046663 A046664 A046665 * A046667 A046668 A046669
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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