A328820 Fourth digit after decimal point of square root of n.

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

Maxim Skorohodov, Table of n, a(n) for n = 1..10000

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

Cf. A111862, A023961.

Sequence in context: A181566 A348513 A110173 * A259863 A283666 A131427

Adjacent sequences: A328817 A328818 A328819 * A328821 A328822 A328823

Keyword

nonn,easy,base

Author

Maxim Skorohodov, Oct 28 2019

Status

approved