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a(n) is least k such that k and 5k are anagrams in base n (written in base 10).
1

%I #5 Mar 30 2012 18:35:18

%S 245,2985,525,1208,142857,20,2970,21,3419,69034,11220,24,459,9720,

%T 25935,55,13671,88,52900,630,21775,535483,22113,35,2175,35520,1240,

%U 43520,102795,204,1505,171,253783,2660,112008,140,6027,89208,96105,253,547515

%N a(n) is least k such that k and 5k are anagrams in base n (written in base 10).

%K nonn,base

%O 6,1

%A _David W. Wilson_