define lcm function
static int lcm_fun ( int a , int b ) { if ( b == 0 ) return a ; return lcm_fun ( b , a % b ) ; } static int digitLCM ( int n ) { int lcm = 1 ; while ( n > 0 ) { lcm = ( n % 10 * lcm ) / lcm_fun ( n % 10 , lcm ) ;