1, 3, 6, 10, 15, 21
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It has 6 vertices, 9 edges and 5 faces
Triangles for a triangular prism. Not sure about trangular prism, though.
The first 6 composite numbers are 4, 6, 8, 9, 10, and 12.
A trangular based pyramid has 4 faces, 6 edges and 4 vertices
A triangular prism has 5 faces, 9 edges and 6 vertices