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

Author

Maxim Skorohodov, Oct 28 2019

Keywords

• nonn
• easy
• base

Examples

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

Links

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

Crossrefs

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

Cf. A000196, A010879.

Programs

PARI

a(n) = floor(10^3*sqrt(n)) % 10; \\ Jinyuan Wang, Nov 03 2019

Formula

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