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%I #5 Oct 04 2012 16:26:59
%S 20,1218,7540,20280,1373090,4903600,23308460,316540365,527813814,
%T 4091661910,16718044954,1034412600,142903074740,1827252574658,
%U 31036383127940
%N Primitive numbers n whose square can be represented as a four "digit" repdigit number in some base < n.
%e 20^2 = 1111 in base 7
%e 1218^2 = (21)(21)(21)(21) in base 41
%e 7540^2 = (58)(58)(58)(58) in base 99
%Y A158235, A158245
%K nonn,base
%O 1,1
%A _T. D. Noe_, Mar 30 2009
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