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A wasteful number is a number with fewer digits than that of its prime factorization.

The first wasteful numbers are 4, 6, 8, 9, X, 10, 16, 18, 20, 22, 24, 26, 2X, 30, 32, 33, 34, 36, 38, 39, 3X, 40, 42, 43, 44, 46, 48, 49, 4X, 50, 52, 53, 55, 56, 58, 59, 5X, 60, 62, 63, 64, 66, 68, 6X, 70, 71, 72, 73, 74, 76, 77, 78, 79, 7X, 7E, 80, 82, 83, 84.

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