The idea of the look-and-say sequence is similar to that of run-length encoding. The look-and-say sequence was analyzed by John Conway Īfter he was introduced to it by one of his students at a party. 21 is read off as "one 2, one 1" or 1211.To generate a member of the sequence from the previous member, read off the digits of the previous member, counting the number of digits in groups of the same digit. These lines (when represented in a logarithmic vertical scale) tend to straight lines whose slopes coincide with Conway's constant. The lines show the growth of the numbers of digits in the look-and-say sequences with starting points 23 (red), 1 (blue), 13 (violet), 312 (green).
For the method for learning to read, see look-and-say method.
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