A020778 Decimal expansion of 1/sqrt(21).

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

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• cons

Comments

1/sqrt(21) = 0.218217890235992381266097485415619451856402694131808185838440101138422305978... [Vladimir Joseph Stephan Orlovsky, May 30 2010]

Links

• Ivan Panchenko, Table of n, a(n) for n = 0..1000

Programs

Mathematica

RealDigits[N[1/Sqrt[21],200]][[1]] (* Vladimir Joseph Stephan Orlovsky, May 30 2010 *) (* Modified by Harvey P. Dale, Feb 08 2023 *)