A375958 The smallest positive number that when written in all bases 2 to n contains two or more adjacent equal digits.
3, 4, 22, 31, 43, 122, 506, 506, 1187, 3199, 11663, 18773, 18815, 32399, 177216, 177216, 177227, 5225284, 5225284, 14295600, 21566225, 36572552, 107730081, 107832239, 952416000, 2293096006, 5587865542, 6587515515, 30174888567, 30174888567, 107824082399
Offset: 2
Keywords
Examples
a(7) = 122 as 122 = 1111010_2 = 11112_3 = 1322_4 = 442_5 = 322_6 = 233_7, each of which contains two or more adjacent equal digits.