Create a delightful birthday-themed illustration that features three adorable lambs of varying descents playfully frolicking amidst a pastel-colored landscape. At the focal point of the image, render the number nine, designed with soft edges and a playful font that beckons celebration. To emphasize the 'prime' theme, subtly incorporate prime numbers into the background. These prime numbers are cleverly integrated elements such as party balloons and presents. The overall scene should evoke a whimsical, welcoming atmosphere that resonates with the joy of childhood.

Generated with these themes: Lambs, Nine, and Prime.

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