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3n concatenated with itself.
1

%I #18 Jan 14 2019 17:30:19

%S 33,66,99,1212,1515,1818,2121,2424,2727,3030,3333,3636,3939,4242,4545,

%T 4848,5151,5454,5757,6060,6363,6666,6969,7272,7575,7878,8181,8484,

%U 8787,9090,9393,9696,9999,102102,105105,108108,111111,114114,117117,120120,123123

%N 3n concatenated with itself.

%t #*10^IntegerLength[#]+#&/@(3*Range[50]) (* _Harvey P. Dale_, Jan 14 2019 *)

%K nonn,base,easy

%O 1,1

%A _Larry Guindine_, Sep 30 2014

%E Definition edited by _N. J. A. Sloane_, Sep 30 2014

%E More terms from _Alois P. Heinz_, Sep 30 2014