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The (n-1)th decimal place of the fractional part of the square root of n.
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%I #15 May 21 2021 02:19:33

%S 0,4,3,0,0,8,1,1,0,0,3,3,3,9,1,0,5,4,2,8,8,5,4,6,0,1,2,7,5,0,8,7,2,3,

%T 0,0,2,2,7,9,4,0,6,0,7,3,0,4,0,7,3,2,4,8,8,6,9,0,7,4,3,5,7,0,2,3,3,9,

%U 8,7,5,7,9,6,4,6,3,4,9,5,0,3,5,0,7,0,2

%N The (n-1)th decimal place of the fractional part of the square root of n.

%C If n=1 then the term is the first digit before the decimal point. If the square root of n is a whole number then the term is 0.

%e If n=2, sqrt(2)=1.41421356 approx., the 1st(2-1) decimal place of which is 4 so the 2nd term is 4. If n=3, sqrt(3)=1.73205081 approx., the 2nd(3-1) decimal place of which is 3 so the 3rd term is 3.

%t Join[{0}, Table[RealDigits[Sqrt[n] - Floor[Sqrt[n]], 10, n, -1][[1, -2]], {n, 2, 87}]]

%o (Python)

%o for n in range(1,16):

%o x=str(n**0.5)

%o for i in range(n):

%o x=x+"0"

%o if n==1:

%o r=str(x[-1])

%o else:

%o r=r+","+str(x[n])

%o if n==15:

%o print(r)

%Y Cf. A003076 (n-th digit after decimal point of square root of n).

%K nonn,base

%O 1,2

%A _Ruskin Harding_, Jan 04 2013