1, 3, 6, 10, 15, 21, 28, 36, 45, 55
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3.141592653
Ordinary numbers
The first ten positive numbers total 55.
The average of the first ten prime numbers is 12.9.
The first ten happy numbers are: 1, 7, 10, 13, 19, 23, 28, 31, 32, 44