|
Search: id:A068421
|
|
|
| A068421 |
|
Numbers n such that sigma(n)=6*(n-phi(n)). |
|
+0
1
|
| |
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
No other term < 3500000. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 08 2006
|
|
MAPLE
|
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
|
|
CROSSREFS
|
Adjacent sequences: A068418 A068419 A068420 this_sequence A068422 A068423 A068424
Sequence in context: A072952 A013736 A060758 this_sequence A142535 A117709 A133750
|
|
KEYWORD
|
easy,more,nonn,bref
|
|
AUTHOR
|
Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 02 2002
|
|
|
Search completed in 0.002 seconds
|
