Question

How to print all pronic numbers between 1 and 100 in Node.js

Answer 1

// A pronic number is a number which is the product of two consecutive integers
// 42 = 6 * 7 -> yes 6 and 7 is consecutive integers
// 45 = 5 * 9 -> no 5 and 9 is not consecutive integers

function isPronicNumber(num) {  
    for (let i = 1; i <= num; i++) {  
        if ((i * (i + 1)) == num) {  
            return true;
        }  
    }  
    return false;  
}  

for (let i = 1; i <= 100; i++) {  
    if (isPronicNumber(i))  
        console.log(i);  
}  




/*
run:

2
6
12
20
30
42
56
72
90

*/

 

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