13 lines
247 B
Text
13 lines
247 B
Text
for n in (1 .. 2**19) {
|
|
var frac = 0
|
|
|
|
n.divisors.each {|d|
|
|
frac += 1/d
|
|
}
|
|
|
|
if (frac.is_int) {
|
|
say "Sum of reciprocal divisors of #{n} = #{frac} exactly #{
|
|
frac == 2 ? '- perfect!' : ''
|
|
}"
|
|
}
|
|
}
|