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A084854 Triangular array, read by rows: T(n,k) = concatenated decimal representations of n and k, 1<=k<=n.

%I A084854 #15 Nov 21 2021 14:05:03
%S A084854 11,21,22,31,32,33,41,42,43,44,51,52,53,54,55,61,62,63,64,65,66,71,72,
%T A084854 73,74,75,76,77,81,82,83,84,85,86,87,88,91,92,93,94,95,96,97,98,99,
%U A084854 101,102,103,104,105,106,107,108,109,1010,111,112,113,114,115,116,117,118,119,1110,1111
%N A084854 Triangular array, read by rows: T(n,k) = concatenated decimal representations of n and k, 1<=k<=n.
%H A084854 Indranil Ghosh, <a href="/A084854/b084854.txt">Rows 1..100 of triangle, flattened</a>
%F A084854 T(n, k) = n*10^A055642(k) + k.
%F A084854 T(n, 1) = A017281(n); T(n, n) = A020338(n).
%o A084854 (Python)
%o A084854 def T(n, k): return int(str(n) + str(k))
%o A084854 def auptorow(maxrow):
%o A084854     return [T(n, k) for n in range(1, maxrow+1) for k in range(1, n+1)]
%o A084854 print(auptorow(11)) # _Michael S. Branicky_, Nov 21 2021
%Y A084854 Cf. A017281, A020338, A055642, A066686, A067574, A084855.
%K A084854 nonn,base,tabl
%O A084854 1,1
%A A084854 _Reinhard Zumkeller_, Jun 09 2003