253 = 11 x 23.
253 has a unique representation as a sum of three squares: 253 = 32 + 102 + 122.
253 is the sum of three positive cubes: 253 = 53 + 43 + 43.
25 - 3 is a prime number.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuAvNnoxKO8Z0zdxq5NmktsjYuo_C9_yLiQHRggoTII2ddGrd5Donq_MRk3YsutyWRp8mAybZfB8jIK0DssRlFniiZR-zLHRmT7gAY6nR4-drVtG2gt73etTjPnehrZz1zl0mw_gJN58o/s400/n0253.jpg)
253 is a star number. The nth star number is given by the formula 6n(n - 1) + 1.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEis-x4RPWDk4b-Ow8pivl_-RzzAt0RC8lCYWyd6V0MJGyl0iiE0ZFh-On1NgD9X2ZQIBjXnhIXfS6rbOMnVieSQySg53ebnFh7vV81b7JC-H3xnwL1S_7pTipnM7s1ObUjzrslJIffOHls/s400/starnumber.jpg)
NGC 253, also known as the Silver Coin Galaxy or the Sculptor Galaxy, is a large spiral galaxy in the constellation Sculptor.
25 - 3 is a prime number.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuAvNnoxKO8Z0zdxq5NmktsjYuo_C9_yLiQHRggoTII2ddGrd5Donq_MRk3YsutyWRp8mAybZfB8jIK0DssRlFniiZR-zLHRmT7gAY6nR4-drVtG2gt73etTjPnehrZz1zl0mw_gJN58o/s400/n0253.jpg)
253 is a star number. The nth star number is given by the formula 6n(n - 1) + 1.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEis-x4RPWDk4b-Ow8pivl_-RzzAt0RC8lCYWyd6V0MJGyl0iiE0ZFh-On1NgD9X2ZQIBjXnhIXfS6rbOMnVieSQySg53ebnFh7vV81b7JC-H3xnwL1S_7pTipnM7s1ObUjzrslJIffOHls/s400/starnumber.jpg)
NGC 253, also known as the Silver Coin Galaxy or the Sculptor Galaxy, is a large spiral galaxy in the constellation Sculptor.
Source: Wikipedia
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