16149...00551 (7850-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

71^73 + 3635·(71+73)^3635 arises from the 8th twin prime pair (71, 73), whose sum 71 + 73 = 144 = 12² is a perfect square. The scalar coefficient 3635 = 5 × 727, where 727 is itself a palindromic prime. This prime is an instance of the parametric family p^q + i·(p+q)^i evaluated at the twin prime pair (p, q) = (71, 73) with i = 3635. [Adolpho]