A375997 The smallest positive number that when written in all bases 2 to n contains three or more adjacent equal digits.
7, 39, 234, 687, 3882, 13999, 196017, 786499, 2790000, 3898880, 150002496, 150002496, 22094555327, 164777407488
Offset: 2
Examples
a(7) = 13999 as 13999 = 11011010101111_2 = 201012111_3 = 3122233_4 = 421444_5 = 144451_6 = 55546_7, each of which contains three or more adjacent equal digits.