287 = 7 x 41.
287 is a number that cannot be written as a sum of three squares.
287 is a pentagonal number.
287 is the sum of consecutive primes in three different ways: 287 = 89 + 97 + 101 = 47 + 53 + 59 + 61 + 67 = 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47.
Source: Prime Curios!
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