Do These Numbers Ring a Bell?

1.   1760
2.   2000
3.   4840
4.   640
5.   1.732
6.   2.54
7.   3.1416
8.   366
9.   1492
10.   1.414
11.   1728
12.   3-4-5
13.   6080
14.   62.5
15.   90

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