Triangular numbers

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A triangular number is an integer that is usually represented by points and forms the geometric figure of the triangle : 1, 3, 6, 10, ie

Triangular numbers are obtained by adding integers :

• 1 = 1
• 1 + 2 = 3
• 1 + 2 + 6 = 6
• 1 + 2 + 6 + 4 = 10
• etc

The number 10, the theosophical addition of the number 4, is the fourth triangular number. It comes from the addition of the first 4 integers.

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