A375997
The smallest positive number that when written in all bases 2 to n contains three or more adjacent equal digits.
Original entry on oeis.org
7, 39, 234, 687, 3882, 13999, 196017, 786499, 2790000, 3898880, 150002496, 150002496, 22094555327, 164777407488
Offset: 2
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.
A375998
The smallest positive number that when written in all bases 2 to n contains four or more adjacent equal digits.
Original entry on oeis.org
15, 80, 4010, 12031, 255312, 2686719, 117178358, 436210878, 91532745555
Offset: 2
a(7) = 2686719 as 2686719 = 1010001111111011111111_2 = 12001111111010_3 = 22033323333_4 = 1141433334_5 = 133330303_6 = 31560000_7, each of which contains four or more adjacent equal digits.
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