Perrin (Victor Perrin)

Victor Perrin was a French mathematician known for his work in number theory, particularly Perrin's sequence. This sequence is a list of numbers starting with 3, 0, 2, and each subsequent number is the sum of the two numbers three and two places before it (e.g., 3, 0, 2, 3, 2, 5, 5, 7...). Perrin's sequence is notable because a prime number (like 2, 3, 5, 7) appears in the sequence if and only if it divides a certain position in the sequence, making it useful in primality testing.