Question

How to print all pronic numbers between 1 and 100 in PHP

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($num) {  
    for ($i = 1; $i <= $num; $i++) {  
        if (($i * ($i + 1)) == $num) {  
            return true;
        }  
    }  
    return false;  
}  
  
for ($i = 1; $i <= 100; $i++) {  
    if (isPronicNumber($i))  
        echo $i . " ";  
}  
 
  
  
  
  
  
/*
run:
  
2 6 12 20 30 42 56 72 90 
  
*/

 

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