i first learned this puzzle from Hofstadter's book, but recently heard that a variant was used as an interview question, so i would like to share: fill in the blanks with a numeral in
decimal notation: (1) In this sentence, the number of occurrences of 0 is __, of 1 is __, of 2 is __, of 3 is __, of 4 is __, of 5 is __, of 6 is __, of 7 is __, of 8 is __, and of 9 is __....