15 Dec
2011
15 Dec
'11
3:59 p.m.
Submitted as A202296. On 12/15/2011 4:15 PM, N. J. A. Sloane wrote:
It is 72, I think, for x = 125 Yes, you are right. It seems likely that 72 should suffice for all integers x. What about the sequence: a(n) = smallest k such that ... ? With a(125) = 72. Could you please submit it? (With keyword "base", of course) Neil
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