The first 5 primes of this form are of lengths 3, 5, 7, 95, and 161 (131, 13331, 1333331, etc.). Can it be shown there are an infinite number of primes with form 133...331? Can it be shown there are only a finite number of them?
2026-04-19 17:37:49.1776620269
Are there an infinite number of primes of the form 133...331?
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