8951
This number is a prime.
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A total of exactly 8951 "+" signs are required in writing out the partitions of the prime 23 (23 = 22 + 1 = 21 + 2 = 21 + 1 + 1 = ... = 1 + 1 + ... + 1 + 1). Note that 8 + 9 + 5 + 1 = 23. [Beedassy]
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