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A328820
Fourth digit after decimal point of square root of n.
1
0, 2, 0, 0, 0, 4, 7, 4, 0, 2, 6, 1, 5, 6, 9, 0, 1, 6, 8, 1, 5, 4, 8, 9, 0, 0, 1, 5, 1, 2, 7, 8, 5, 9, 0, 0, 7, 4, 9, 5, 1, 7, 4, 2, 2, 3, 6, 2, 0, 0, 4, 1, 1, 4, 1, 3, 8, 7, 1, 9, 2, 0, 2, 0, 2, 0, 3, 2, 6, 6, 1, 2, 0, 3, 2, 7, 9, 7, 1, 2, 0, 3, 4, 1, 5, 6, 3, 8, 9, 8, 3, 6, 6, 3, 7, 9, 8, 4, 8, 0
OFFSET
1,2
LINKS
FORMULA
a(n) = A010879(A000196(100000000*n)).
EXAMPLE
sqrt(5) = 2.23606798..., so a(5) = 0.
PROG
(C++) int a(int n) { return int(10000 * sqrt(n)) % 10; }
CROSSREFS
Sequence in context: A181566 A348513 A110173 * A259863 A283666 A131427
KEYWORD
nonn,easy,base
AUTHOR
Maxim Skorohodov, Oct 28 2019
STATUS
approved