**The number of ways two "digits" can be multiplied to get (0 mod k) in base k. This number can never be less than k. In base 4, 2*2 = (0 mod 4), so there are 5 ways to get 0 in base 4.**

*1, 2, 3, 5, 5, 8, 7, 11, 12, 14, 11, 21, 13, 20, 23, 26, 17, 33, 19, 37, 33, 32, 23, 51, 35*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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