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365 (number) - Wikipedia

From Wikipedia, the free encyclopedia

Natural number

365 (three hundred [and] sixty-five) is the natural number following 364 and preceding 366.

365 is a semiprime centered square number. It is also the fifth 38-gonal number.

For multiplication, it is calculated as 5 × 73 {\displaystyle 5\times 73} . Both 5 and 73 are prime numbers.

It is the smallest number that has more than one expression as a sum of consecutive square numbers:

365 = 13 2 + 14 2 {\displaystyle 365=13^{2}+14^{2}}
365 = 10 2 + 11 2 + 12 2 {\displaystyle 365=10^{2}+11^{2}+12^{2}}

There are no known primes with period 365, while at least one prime with each of the periods 1 to 364 is known.

There are 365.2422 solar days in the mean tropical year. Several solar calendars have a year containing 365 days.[1] Related to this, in Ontario, the driver's license learner's permit used to be called "365"[2][3] because it was valid for only 366 days. Financial and scientific calculations often use a 365-day calendar to simplify daily rates.

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