12345...54321 (97-digits)

This number is a prime.

1234567 8987654321 2345678987
6543212345 6789876543 2123456789 8765432123 4567898765 4321234567 8987654321

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The largest 'Peak and Valley' prime (i.e., prime of the form 12345678987654321...12345678987654321). [Patterson]

Submitted: 2003-07-25 01:23:06; Last Modified: 2017-12-20 19:26:02.