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Numbers n such that both n and n^2 contain "123" as a substring.
3

%I #7 Jan 30 2016 04:10:38

%S 11123,12394,35123,50123,98123,111123,111230,111231,111232,111233,

%T 111234,111235,111236,111237,111238,111239,112394,123305,123463,

%U 123726,123743,123940,212394,312394,335123,351123,351230

%N Numbers n such that both n and n^2 contain "123" as a substring.

%H Zak Seidov, <a href="/A268278/b268278.txt">Table of n, a(n) for n = 1..3000</a>

%e 11_123_^2 = 123_721129.

%Y Subsequence of A178314. Cf. A175464.

%K nonn,base

%O 1,1

%A _Zak Seidov_, Jan 29 2016