Analysis#

The phrase “One Step Ahead” and “yang datang setelahnya” points to the idea of the next number—one step forward, not the current value.

Starting from 86, one step ahead gives 87.

The challenge then connects this to “special numbers”, leading to prime-number confusion. The writeup notes that 87 is known as the 23rd prime number.

Solution#

Following that interpretation, the resulting flag is:

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