RosettaCodeData/Task/Perfect-numbers/Lambdatalk/perfect-numbers-1.lambdatalk

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{def perf
{def perf.sum
{lambda {:n :sum :i}
{if {>= :i :n}
then {= :sum :n}
else {perf.sum :n
{if {= {% :n :i} 0}
then {+ :sum :i}
else :sum}
{+ :i 1}} }}}
{lambda {:n}
{perf.sum :n 0 2} }}
-> perf
{S.replace \s by space in
{S.map {lambda {:i} {if {perf :i} then :i else}}
{S.serie 2 1000 2}}}
-> 6 28 496 // 5200ms