%I #20 Mar 04 2020 22:47:23
%S 1,1,4,1,7,3,2,0,0,0,2,2,3,6,0,2,4,4,9,4,8,2,6,4,5,7,5,1,2,8,2,8,4,2,
%T 7,1,3,0,0,0,0,0,0,0,0,3,1,6,2,2,7,7,6,6,0,3,3,1,6,6,2,4,7,9,0,3,3,4,
%U 6,4,1,0,1,6,1,5,1,3,3,6,0,5,5,5,1,2,7,5,4,6,3,3,7,4,1,6,5,7,3
%N Triangle in which row n has the first n digits of sqrt(n) (truncated).
%H T. D. Noe, <a href="/A037022/b037022.txt">Rows n=1..100 of triangle, flattened</a>
%e Triangle starts:
%e 1;
%e 1, 4;
%e 1, 7, 3;
%e 2, 0, 0, 0;
%e 2, 2, 3, 6, 0;
%e 2, 4, 4, 9, 4, 8;
%e 2, 6, 4, 5, 7, 5, 1;
%e ...
%t row[n_] := RealDigits[Sqrt[n], 10, n][[1]]; Table[row[n], {n, 1, 14}] // Flatten (* _Jean-François Alcover_, Dec 03 2016 *)
%Y Cf. A000196 (first column), A023961 (second column), A037023.
%K nonn,base,nice,easy,tabl
%O 1,3
%A Jonas Persson (jptmp(AT)hotmail.com), _N. J. A. Sloane_