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Search: id:A081397
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OFFSET
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1,1
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FORMULA
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a[n]=Min{x; A081396[x]=A002110[n]}
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EXAMPLE
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n=284229: sigma[284229]=482790=2.3.5.7.11.19, phi[284229]=166320=2.2.2.3.3.3.3.5.7.11, common-factor-set={2,3,5,7,11}, GCD[sigma,phi]=2310.
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CROSSREFS
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Cf. A000203, A002110, A000010, A081383, A081396.
Sequence in context: A001320 A133028 A144985 this_sequence A092987 A088334 A050645
Adjacent sequences: A081394 A081395 A081396 this_sequence A081398 A081399 A081400
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Mar 28 2003
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