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added 60 characters in body

edited Jun 28, 2017 at 15:02

#Japt, ~~(削除) 8+2=10 (削除ここまで)~~ 8 bytes

ò2_â1Ãxo

Test it

1 byte saved thanks to ETHproductions.

##Explanation :Implicit input of integer U. ò2 :Generate an array of integers from 2 to U, inclusive _ :Passing each number through a function that returns... â : the divisors of the number, 1 : excluding itself. Ã :End function. x :Sum the main array o :by popping the last element from each sub-array. :Implicit output of result

answered Jun 24, 2017 at 12:21

Shaggy