53337...33377 (100-digits)

This number is a prime.

                                            5333755373 3377557753 7575735377
3775757557 3557773753 5737555533 7537537537 5757333333 5373535535 5753533377

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A random 100-digit "Prime-Prime," i.e., a prime such that all of its digits are odd primes. [Brown]