### Possible Answer

What is special about the following sequence of numbers 1 11 21 1211 111221 312211 13112221? This is a word puzzle describing the digits in the sequence. Literally say what you see to find the next term. 1 = one one11 = two ones21 = one two, one one1211 = one one, ... - read more

1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211, ... (sequence A005150 in OEIS). ... No digits other than 1, 2, and 3 appear in the sequence, unless the seed number contains such a digit or a run of more than three of the same digit. - read more

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