%I #18 Feb 28 2023 02:15:38
%S 0,1,3,4,4,5,6,6,7,7,8,8,8,9,9,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,3,3,4,
%T 4,4,4,4,4,5,5,5,5,5,5,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,
%U 8,8,9,9,9,9,9,9,9,9,9,9,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1
%N First digit after decimal point of 4th root of n.
%H Vincenzo Librandi, <a href="/A023963/b023963.txt">Table of n, a(n) for n = 1..1000</a>
%t Array[ Function[ n, RealDigits[ N[ Power[ n, 1/4 ], 10 ], 10 ]// (#[ [ 1, #[ [ 2 ] ]+1 ] ])& ], 110 ]
%o (Python)
%o from sympy import integer_nthroot
%o def A023963(n): return integer_nthroot(n*10**4,4)[0]%10 # _Chai Wah Wu_, Feb 27 2023
%K nonn,base
%O 1,3
%A _N. J. A. Sloane_, _Olivier GĂ©rard_
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