47

This number is a prime.

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Largest known prime of the form 2^p + p-th triangular number (i.e., 2^5 + 5*(5+1)/2 = 47), where p is a prime. Is there a larger example? [Sariyar]

Submitted: 2022-07-25 16:03:25; Last Modified: 2025-04-04 16:25:26.