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a(n) is the conjectured highest power of n which has no three identical digits in succession.
9

%I #8 Sep 17 2012 21:11:11

%S 1583,1175,774,1359,776,607,516,579,2,472,390,460,812,426,387,800,502,

%T 476,2,400,472,387,298,382,466,386,249,374,2,238,237,289,243,338,388,

%U 254,189,263,2,481,442,389,398,232,412,296,284,261,2,216,329,367,341,271,186,349,340,236

%N a(n) is the conjectured highest power of n which has no three identical digits in succession.

%H V. Raman, <a href="/A216064/b216064.txt">Table of n, a(n) for n = 2..99</a>

%Y Cf. A216063, A216065.

%K nonn,base

%O 2,1

%A _V. Raman_, Sep 01 2012