4 5 n 1 2 July 8, 2019 16 32 64 128 4 5 n 1 20 4 5 n 2 )= 1 1 15 4 2n 5 n 1 1 2 3 4 5 n =- 1 12 1 2 3 4 5 n 1 4 n 1 5 2n 1 is divisible by 21 1 2 3 4 5 n formula N 1 2 3 4 5 6 1 2 3 4 5 n 666 80n 4 2n 1 * 5 n 2 1 n 2 3 4 5 6 dövme N 4 5 n 6 1 2 N 4 5 n 6 1 2 solve 5 n 1 4 2n 3 N 4 5n 1 2
