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Somehow I've memorised 10243 in order to have a "big prime" that most people can't just determine. Note its the lowest 5 digits.

I'm always using 1000003 and 1000000009 if I need a big prime in code. Million 3, billion 9 - very easy to remember

I've now memorized 10247, the second-lowest over 5 digits. Everyone else get in line.