12

This number is a composite.

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The only multidigit number n up to 10000 such that 2^n+3 and 2^n-3, are primes. Another prime of this form, if it exists, will have more 3000 digits. [Bajpai]

Submitted: 2013-01-18 13:27:50; Last Modified: 2020-01-24 02:13:57.