#Japt, 8+2=10 8 6 bytes

òâ1 xo

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##Explanation :Implicit input of integer U. ò :Generate an array of integers from 1 to U, inclusive â :Get the divisors of each number, 1 : excluding itself. x :Sum the main array o :by popping the last element from each sub-array. :Implicit output of result

Japt, 8+2=10 8 6 bytes

òâ1 xo

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• 1 byte saved thanks to ETHproductions.

Explanation

    :Implicit input of integer U.
ò   :Generate an array of integers from 1 to U, inclusive
â   :Get the divisors of each number,
1   :  excluding itself.
x   :Sum the main array
o   :by popping the last element from each sub-array.
    :Implicit output of result

#Japt, 8+2=10 8 bytes

ò2_â1Ãxo

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##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

#Japt, 8+2=10 8 6 bytes

òâ1 xo

Test it

• 1 byte saved thanks to ETHproductions.

##Explanation :Implicit input of integer U. ò :Generate an array of integers from 1 to U, inclusive â :Get the divisors of each number, 1 : excluding itself. x :Sum the main array o :by popping the last element from each sub-array. :Implicit output of result

#Japt, 8+2=10 8 bytes

ò2_â1Ãxo

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• 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

#Japt, 8+2=10 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