A328819 Third digit after decimal point of square root of n.

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

Offset

1,2

Links

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

Formula

a(n) = A010879(A000196(1000000*n)).

Example

sqrt(21) = 4.58257569..., so a(21) = 2.

Prog

(C++) int a(int n) { return int(1000 * sqrt(n)) % 10; }
(PARI) a(n) = floor(10^3*sqrt(n)) % 10; \\ Jinyuan Wang, Nov 03 2019

Crossrefs

Cf. A023961 (1st digit), A111862 (2nd digit).

Cf. A000196, A010879.

Sequence in context: A352750 A195388 A255324 * A330578 A355289 A245970

Adjacent sequences: A328816 A328817 A328818 * A328820 A328821 A328822

Keyword

nonn,easy,base

Author

Maxim Skorohodov, Oct 28 2019

Status

approved