Question

How to check whether a given number is a pronic number 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;  
}  
 
$num = 42;
     
if (isPronicNumber($num))  
    echo "yes";  
else
    echo "no";  

 
 
 
/*
run:
 
yes
 
*/

 

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