1688816681

This number is a prime.

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The smallest invertible prime p that is the sum of two successive pentagonal numbers: {844372751, 844443930}. Interestingly, p can also be expressed as the sum of two squares, i.e., (29741^2 + 28360^2). [Jha]

Submitted: 2018-12-01 16:28:58; Last Modified: 2018-12-01 18:35:33.