2¹⁹⁸¹ = 2¹⁹⁸⁰ₓ2¹ = (2⁹⁹⁰)²ₓ2 ≠ patrat perfect
3⁴⁸³ = 3⁴⁸²ₓ3¹ = (3²⁴¹)²ₓ3 ≠ patrat perfect
97¹⁴³ = 97¹⁴²ₓ97¹ = (97⁷¹)²ₓ3 ≠ patrat perfect
1998⁷⁸¹ = 1998⁷⁸⁰ₓ1998¹ = (1998³⁹⁰)²ₓ1998 ≠ patrat perfect
3⁸³ = 3⁸⁰ˣ3³
(u)3³ = 7
8⁶⁸ = (2³)⁶⁸ = 2²⁰⁴ = 2²⁰⁰ˣ2⁴
(u)2⁴ = 6
(u)3⁸³ + 8⁶⁸ = 6 + 7 = 13 dar cum nici un patrat perfect nu se termina in 3 => 3⁸³ + 8⁶⁸ ≠ patrat perfect