Irregular rows of bases for which n is palindromic.
2, 3, 2, 4, 5, 2, 6, 3, 7, 2, 8, 3, 4, 9, 10, 5, 11, 3, 12, 6, 13, 2, 4, 14, 3, 7, 15, 2, 4, 16, 5, 8, 17, 18, 3, 9, 19, 2, 4, 6, 20, 10, 21, 3, 22, 5, 7, 11, 23, 4, 24, 3, 5, 12, 25, 2, 8, 26, 3, 6, 13, 27, 4, 28, 9, 14, 29, 2, 5, 30, 7, 15, 31, 2, 10, 32
3
Note that row n ends with the number n-1. The length of row n is 1 if n is in A016038.
T. D. Noe, Plot of 998 irregular rows
T. D. Noe, Table of 998 irregular rows
Eric W. Weisstein, MathWorld: Palindromic Number
(Mma) Table[Flatten[Position[Table[s = IntegerDigits[n, m]; s == Reverse[s], {m, 2, n - 1}], True] + 1], {n, 3, 40}]
Cf. A016038, A135551 (number of terms in row n), S000572.
nonn,base,tabf,nice
T. D. Noe, Apr 13 2015