fun prime(x: Int): Boolean{ //is prime?// var result = 0; var trigger =0; for(i in 2..x-1) { when { x%i ==0 -> trigger +=1 } } when { trigger ==0 -> result +=x } return result == x } fun numLength(x: Int): Boolean{ //last digit == num length?// var num = x.toString(); var rev = num.reversed(); return rev[0].toString().toInt() == rev.length } fun sumTen(x:Int): Boolean{ //sum digits <= 10?// var total =0; var num = x.toString(); for(i in num) { total += i - '0' } return total <= 10 } fun isOdd(x: Int): Boolean { //sum first 2 digits is odd? var num = x.toString(); return ((num[0]-'0')+(num[1]-'0')) %2 ==1; } fun notLast(x:Int): Boolean { //2nd last number is not odd?// var num = x.toString().reversed(); return (num[1]-'0') %2 ==0 && (num[1]-'0') >1; } fun main(args: Array) { var primes = mutableListOf(); var oneSev = mutableListOf(); var lenNum = mutableListOf(); var sumNum = mutableListOf(); var oddTwo = mutableListOf(); var result = mutableListOf(); for(i in 10..1000){//2+ digits// when {//prime numbers// prime(i) -> primes.add(i) } } for(i in primes) { when {//remove 1's & 7's// '1' !in i.toString() && '7' !in i.toString() -> oneSev.add(i) } } for(i in oneSev) { when {//last digit == num length// numLength(i) == true -> lenNum.add(i) } } for(i in lenNum) { when {//sum digits <= 10// sumTen(i) == true -> sumNum.add(i) } } for(i in sumNum) { when {//sum 2 digits is odd// isOdd(i) == true -> oddTwo.add(i) } } for(i in oddTwo) { when { notLast(i) == true -> result.add(i) } } println("Ace's number is $result") }

KT - Ace's Number