JavaScript: Check sum of consecutive positive integers

JavaScript Math: Exercise-73 with Solution

Express as Sum of Consecutive Integers

Write a JavaScript program to check if a given positive integer can be expressed as the sum of two or more consecutive positive integers.

Sample Data:
33 can be represented as 11 + 22
10 = 1+2+3+4
but 8 cannot be represented in this way.

Sample Solution-1:

JavaScript Code:

/**
 * Checks if a given number is not a power of two.
 * @param {number} n - The number to check.
 * @returns {boolean} - True if the number is not a power of two, false otherwise.
 */
function test(n)
{
  // Perform bitwise AND operation between n and n - 1, and check if the result is not zero
  return (n & (n - 1)) != 0;
}

// Test the function with different numbers
console.log(test(33)); // Output: true
console.log(test(10)); // Output: true
console.log(test(8));  // Output: false

Output:

true
true
false

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-73-1 by w3resource (@w3resource) on CodePen.

Sample Solution-2:

JavaScript Code:

/**
 * Checks if a given number is not a power of two.
 * @param {number} n - The number to check.
 * @returns {boolean} - True if the number is not a power of two, false otherwise.
 */
function test(n){
  // Calculate the base-2 logarithm of n and check if it's not an integer
  return !Number.isInteger(Math.log2(n));
}

// Test the function with different numbers
console.log(test(33)); // Output: true
console.log(test(10)); // Output: true
console.log(test(8));  // Output: false

Output:

true
true
false

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-73-2 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that checks if a positive integer can be expressed as the sum of two or more consecutive positive integers.
• Write a JavaScript function that finds one possible sequence of consecutive integers whose sum equals a given number.
• Write a JavaScript function that returns all possible sequences of consecutive numbers that sum to the given integer.
• Write a JavaScript function that validates input and handles cases where no consecutive sequence exists for the given number.

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