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%I #20 Apr 06 2021 04:55:18
%S 10,20,30,40,50,60,70,80,738,820,902,984,1066,1148,1230,1312,1394,
%T 1476,1558,1640,1722,1804,1886,1968,2050,2132,2214,2296,2378,2460,
%U 2542,2624,2706,2788,2870,2952,3034,3116,3198,3280,3362,3444,3526,3608,3690,3772
%N Numbers whose base-9 representation is the juxtaposition of two identical strings.
%H Amiram Eldar, <a href="/A020337/b020337.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) = n*9^floor(log_9(n)+1) + n. - _Ilya Gutkovskiy_, Jan 26 2018
%e 902_10 = 1212_9. - _Jon E. Schoenfield_, Feb 12 2021
%t a[n_] := n + n*9^Floor[Log[9, n] + 1]; Array[a, 50] (* _Amiram Eldar_, Apr 06 2021 *)
%Y Cf. A020330, A020331, A020332, A020333, A020334, A020335, A020336, A020338.
%K nonn,base
%O 1,1
%A _David W. Wilson_, Melia Aldridge (ma38(AT)spruce.evansville.edu)
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