A011273 - OEIS

%I #15 Aug 05 2024 15:42:40

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

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

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

%N Decimal expansion of 19th root of 9.

%H Ivan Panchenko, <a href="/A011273/b011273.txt">Table of n, a(n) for n = 1..1000</a>

%t RealDigits[Surd[9,19],10,120][[1]] (* _Harvey P. Dale_, Aug 05 2024 *)

%o (Python)

%o from sympy import integer_nthroot

%o def A011273(n): return integer_nthroot(9*10**(19*(n-1)),19)[0] % 10 # _Chai Wah Wu_, Mar 07 2022

%K nonn,cons

%O 1,3

%A _N. J. A. Sloane_.

%E Last digit corrected by _Ivan Panchenko_, Sep 04 2014