Better code to solve number puzzle
107742
Insert $+$, $-$, $\times$, $/$, $($, $)$ into $123456789$ to make it equal to $100$
108919
Numbers till 400 divisible by 2, 3, 5, 7
90068
Calculating the number of times a digit is written when given two numbers
148703
Permutations with repeating digits
3514
reversing digits and squaring
26898
Trouble solving two number theoretical problems
74682
How should I solve combination addition like this?
150281
Am I on the right track to figure out this combinatorics problem?
13260
Choosing $101$ numbers from $\{1, 2, \dots , 200\}$.
109055
Round number up to the nearest multiple of 3
39737
Given a series of numbers, generate new numbers that are "similar" to the original numbers
14540
Any shortcut to calculate factorial of a number (Without calculator or n to 1)?
65328
Counts and skips the numbers that have digits divisible by 3 (change in base method)
123851
Is there another simpler method to solve this elementary school math problem?
28613
Anyone can optimized this code for better explanation and easy to understand?
18075
How to mathematically evaluate a string like "2-1" to produce "1"?
116540
Positive integers less than 1000 without repeated digits