User:Toshio Yamaguchi

To do

 * add Classes of natural numbers to pernicious number and add that number class to the template ✅
 * add look-and-say sequence to Classes of natural numbers
 * add Kolakoski sequence to Classes of natural numbers
 * add Maris–McGwire–Sosa pair to Classes of natural numbers
 * add Smith number to Classes of natural numbers
 * add Sum-product number to Classes of natural numbers
 * add Transposable integer to Classes of natural numbers
 * add unitary perfect number to Classes of natural numbers


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