Tushar is very superstitious. So naturally he hates the number 13. Not just that, he even hates numb
Tushar is very superstitious. So naturally he hates the number 13. Not just that, he even hates numbers that consist of only 1s and/or 3s. He calls them 'Unlucky Numbers'
One day (Friday the 13th) he sat down and wondered what the N-th unlucky number would be. Help him figure it out
