A004558 - OEIS

%I #34 Oct 19 2023 09:08:08

%S 2,1,0,4,2,2,3,2,4,0,1,1,3,2,4,1,0,4,0,0,1,3,4,4,1,2,3,3,0,4,1,3,0,4,

%T 2,4,2,2,2,1,2,1,3,2,1,1,3,0,1,3,1,0,3,2,1,0,0,1,0,2,2,1,4,2,3,4,4,4,

%U 3,4,3,4,2,4,2,3,4,4,1,4,4,4,2,1,1,3,0,3,2,1,4,0,1,3,0,3,2,2,1

%N Expansion of sqrt(5) in base 5.

%H G. C. Greubel, <a href="/A004558/b004558.txt">Table of n, a(n) for n = 1..10000</a> (terms 1.2000 from Vincenzo Librandi)

%H Jason Kimberley, <a href="/wiki/User:Jason_Kimberley/sqrt_base">Index of expansions of sqrt(d) in base b</a>

%t RealDigits[Sqrt[5], 5, 100][[1]] (* _Vincenzo Librandi_, Apr 29 2017 *)

%o (Magma) Prune(Reverse(IntegerToSequence(Isqrt(5*5^200), 5))); // _Vincenzo Librandi_, Apr 29 2017

%Y Cf. A002163.

%K nonn,base,cons

%O 1,1

%A _N. J. A. Sloane_

%E Updated by _Alois P. Heinz_ at the suggestion of Kevin Ryde, Feb 19 2012