A067749 Numbers n such that n and 3^n end with the same two digits.

87, 187, 287, 387, 487, 587, 687, 787, 887, 987, 1087, 1187, 1287, 1387, 1487, 1587, 1687, 1787, 1887, 1987, 2087, 2187, 2287, 2387, 2487, 2587, 2687, 2787, 2887, 2987, 3087, 3187, 3287, 3387, 3487, 3587, 3687, 3787, 3887, 3987, 4087, 4187, 4287, 4387