37373...34343 (160-digits)
This number is a prime.
3737373737 3737373737
3737373737 3737373737 3737373737 3737373737 3737373737 3737434343 4343434343
4343434343 4343434343 4343434343 4343434343 4343434343 4343434343 4343434343
Thirty-seven 37's followed by forty-three 43's is prime. [De Geest]
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