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56 (Number)56 (fifty-six) is the natural number following 55 and preceding 57. In mathematics 56 is the sum of the first six triangular numbers (making it a tetrahedral number), as well as the sum of six consecutive primes (3 + 5 + 7 + 11 + 13 + 17). It is also a tetranacci number and a pronic number. In science In astronomy, - Messier object M56, a magnitude 9.5 globular cluster in the constellation Lyra
- The New General Catalogue object NGC 56, an unverified object in the constellation Pisces. NGC 76 does not appear to be a real object.
- The Saros number of the solar eclipse series which began on -1172 July 17 and ended on 144 September 15. The duration of Saros series 56 was 1316.2 years, and it contained 74 solar eclipses.
- The Saros number of the lunar eclipse series which began on -852 May 7 and ended on 428 June 13. The duration of Saros series 56 was 1280.1 years, and it contained 72 lunar eclipses.
In other fields 56 is also: .
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