Number father

Algebra Level 1

The pyramid of integers above is constructed in such a way that each "father" has exactly 3 "children": \[1 \to 2\ \, 3\ \, 4, \quad 2 \to 5\ \, 6\ \, 7, \quad 3 \to 8\ \, 9\ \, 10, \quad 4 \to 11\ \, 12\ \, 13, \quad 5 \to 14\ \, 15\ \, 16,\quad ......\] What number is the father of 2017?

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