This reference unit consists of tables of information about the natural numbers 1 to 99. It is a companion unit to Natural Numbers 100 to 199.

Table 1 is a check list of characteristics: composite, prime, palprime, emirp, deficient, perfect, abundant, square, cubic, power of 2, factorial, and Fibonacci.

Table 2 lists prime factorization, factors, sum of factors, and sum of proper factors.

Down yonder below the numbers, there is a glossary.

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