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Search: id:A068421
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| A068421 |
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Numbers n such that sigma(n)=6*(n-phi(n)). |
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1
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OFFSET
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1,1
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COMMENT
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No other term < 3500000. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 08 2006
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MAPLE
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with(numtheory): a:=proc(n) if sigma(n)=6*(n-phi(n)) then n else fi end: seq(a(n), n=1..5000); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 08 2006
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CROSSREFS
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Sequence in context: A072952 A013736 A060758 this_sequence A142535 A117709 A133750
Adjacent sequences: A068418 A068419 A068420 this_sequence A068422 A068423 A068424
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KEYWORD
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easy,more,nonn,bref
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 02 2002
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