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  • black number - a number comprising of prime digits that adds up to a prime number
ex: 23, 25, 29, 223, 377
  • white number - a number comprising of composite digits that adds up to a composite number
ex: 48, 69, 94, 446, 686
  • gray number - a number comprising of prime digits that adds up to a composite number
ex: 27, 53, 75, 225, 332
  • brown number - a number comprising of composite digits that adds up to a prime number
ex: 49, 67, 89, 335, 469, 689
  • red number - a number that is neither divisible by the sum of the digits nor the product of each digit
ex: 13, 28, 34, 51, 65, 127, 143
  • blue number - a number that is both divisible by the sum of the digits and the product of each digit
ex: 12, 24, 36, 135, 144, 216, 312, 315, 448, 1296
  • green number - a number that is divisible by the product of each digit but not the sum
ex: 11, 15, 128, 1112, 1113, 1111117
  • yellow number - a number that is divisible by the sum of the digits but not the product
ex: 20, 27, 42, 84, 114, 133, 222, 324, 512, 864

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