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A081248
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Number of numbers k<=n with mu(k+n)+mu(k)=0, where mu=A008683 (Moebius function).
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1
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1, 1, 1, 3, 2, 1, 3, 4, 2, 3, 4, 6, 5, 2, 6, 9, 5, 5, 7, 9, 6, 7, 7, 9, 6, 6, 11, 14, 9, 6, 10, 18, 11, 8, 10, 20, 10, 12, 12, 21, 12, 6, 11, 25, 19, 14, 11, 22, 11, 16, 19, 27, 12, 16, 18, 28, 15, 17, 16, 23, 11, 16, 26, 32, 18, 16, 19, 34, 21, 18, 20, 43, 18, 23, 31, 41, 22, 16, 20, 45
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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EXAMPLE
| n=10: mu(1+10)+mu(1)=(-1)+1, mu(5+10)+mu(5)=1+(-1), mu(8+10)+mu(8)=0+0 and mu(k+10)+mu(k)<>0 for k in {2,3,4,6,7,9,10}, therefore a(10)=3.
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CROSSREFS
| Cf. A081247.
Sequence in context: A010267 A023636 A205838 * A129690 A156665 A035572
Adjacent sequences: A081245 A081246 A081247 * A081249 A081250 A081251
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 12 2003
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