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Search: id:A064012
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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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+0
2
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OFFSET
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1,1
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COMMENT
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Is this sequence finite?
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EXAMPLE
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10 belongs to the sequence because usigma(usigma(10))=30=3*10.
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CROSSREFS
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Cf. A034448 A038843.
Sequence in context: A057344 A115134 A098684 this_sequence A063154 A100500 A085473
Adjacent sequences: A064009 A064010 A064011 this_sequence A064013 A064014 A064015
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KEYWORD
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nonn
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AUTHOR
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Felice Russo (felice.russo(AT)katamail.com), Sep 07 2001
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EXTENSIONS
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One more term from Naohiro Nomoto (n_nomoto(AT)yabumi.com), Oct 21 2001. No other terms < 1070000000, Jud McCranie (j.mccranie(AT)comcast.net), Oct 28 2001
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