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昨天儿子给俺发的email：
I have a problem for you:
Try to find the pattern in these sequences:
a) 21 is 9, 9 is 4, 4 is magic
13 is 8, 8 is 5, 5 is 4, 4 is magic
2,009 is 15, 15 is 7, 7 is 5, 5 is 4, 4 is magic
b) 1,11,21,1211,111221,312211,13112221,1113213211,31131211131221,13211311123113112211,... |
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