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A187765 The (n-1)th decimal place of the fractional part of the square root of n. 0
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, 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, 8, 7, 5, 7, 9, 6, 4, 6, 3, 4, 9, 5, 0, 3, 5, 0, 7, 0, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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.

LINKS

Table of n, a(n) for n=1..87.

EXAMPLE

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.

MATHEMATICA

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

PROG

(Python)

for n in range(1, 16):

...x=str(n**0.5)

...for i in range(n):

.......x=x+"0"

...if n==1:

.......r=str(x[n-1])

...else:

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

...if n==15:

.......print(r)

CROSSREFS

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

Sequence in context: A257536 A019983 A019984 * A274818 A274819 A106646

Adjacent sequences:  A187762 A187763 A187764 * A187766 A187767 A187768

KEYWORD

nonn,base

AUTHOR

Ruskin Harding, Jan 04 2013

STATUS

approved

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Last modified August 18 00:56 EDT 2019. Contains 326059 sequences. (Running on oeis4.)