add: solution to project euler problem 23 md file (#38369)

curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-23-non-abundant-sums.english.md

@@ -67,7 +67,40 @@ sumOfNonAbundantNumbers(28123);
 <section id='solution'>
 
 ```js
-// solution required
+function abundantCheck(number) {
+  let sum = 1;
+
+  for (let i = 2; i <= Math.sqrt(number); i += 1) {
+    if(number % i === 0) {
+      sum += i + +(i !== Math.sqrt(number) && number / i);
+    }
+  }
+  return sum > number;
+}
+
+function sumOfNonAbundantNumbers(n) {
+  let sum = 0;
+  const memo = {};
+  let abundantList = [];
+
+  // Function checkSum checks if num can be represented as a sum of numbers in the stack (array)
+  const checkSum = (num, stack, memo) => {
+    for (let i = 0; i < stack.length; i += 1) {
+      if ((num - stack[i]) in memo) return true;
+    }
+    return false;
+  };
+
+  for (let i = 1; i <= n; i += 1) {
+    if (abundantCheck(i)) {
+      abundantList.push(i);
+      memo[i] = 1;
+    }
+    if (checkSum(i, abundantList, memo)) continue;
+    sum += i;
+  }
+  return sum;
+}
 ```
 
 </section>