Proper divisors: Difference between revisions
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===Package solution===
{{Works with|R|3.3.2 and above}}
<lang
require(numbers);
V <- sapply(1:20000, Sigma, k = 0, proper = TRUE); ind <- which(V==max(V));
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===Filter solution===
<lang
#Has no input error checking.
properDivisors<-function(n)
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