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A064012
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usigma(usigma(n))=3*n where usigma(n) is the sum of unitary divisors of n (A034448).
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1
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OFFSET
| 1,1
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COMMENTS
| Is this sequence finite?
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EXAMPLE
| 10 belongs to the sequence because usigma(usigma(10))=30=3*10.
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CROSSREFS
| Cf. A034448 A038843.
Sequence in context: A115134 A185829 A098684 * A187521 A187624 A187633
Adjacent sequences: A064009 A064010 A064011 * A064013 A064014 A064015
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KEYWORD
| nonn
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AUTHOR
| Felice Russo (frusso(AT)micron.com), Sep 07 2001
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EXTENSIONS
| One more term from Naohiro Nomoto (n_nomoto(AT)yabumi.com), Oct 21 2001. No other terms < 1070000000, Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Oct 28 2001
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