41 (forty-one) is the natural number following 40 and preceding 42. Look up forty-one in Wiktionary, the free dictionary. the 13th smallest prime number. The next is 43, making both twin primes. the sum of the first six prime numbers (2 + 3 + 5 + 7 + 11 + 13). a Newman–Shanks–Williams prime. [2] More @Wikipedia
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