A178002 Largest n-digit prime with the most digits equal to 4.
7, 47, 449, 4447, 44449, 444449, 7444441, 74444449, 444444443, 4444444447, 44444444441, 444444444443, 5444444444443, 84444444444449, 494444444444441, 8444444444444443, 74444444444444441, 494444444444444447
Offset: 1
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