3 is the only integer which is the sum of the preceding positive integers (1+2=3) and the only number which is the sum of the factorials of the preceding positive integers (1!+2!=3).. Includes prime factorization, divisors, bases and fun facts for students, number lovers and curious minds.
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It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number.. Watch numberblocks full episodes on bbc iplayer: