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41 (Number)41 is the natural number following 40 and preceding 42. Forty-one is the 13th smallest prime number. The next is forty-three, with which it comprises a twin prime. Forty-one is also a Sophie Germain prime and a Newman-Shanks-Williams prime. 41 is the smallest Sophie Germain prime to start a Cunningham chain of the first kind of three terms, {41, 83, 167}. The number figures in the polynomial f(n) = n2 + n + 41, which yields primes for 0 <= n < 40. Forty-one is the sum of two squares, 42 + 52, as well as the sum of the first six prime numbers, and also the sum of three primes (11 + 13 + 17). It is a centered square number. In science In astronomy, - Messier object M41, a magnitude 5.0 open cluster in the constellation Canis Major
- The New General Catalogue object NGC 41, a spiral galaxy in the constellation Pegasus
- The Saros number of the solar eclipse series which began on -1588 May 28 and ended on -308 July 5. The duration of Saros series 41 was 1280.1 years, and it contained 72 solar eclipses.
- The Saros number of the lunar eclipse series which began on -1268 March 18 and ended on 30 May 6. The duration of Saros series 41 was 1298.1 years, and it contained 73 lunar eclipses.
Forty-one is also:
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