A118943 - OEIS

%I #6 Feb 11 2018 16:35:49

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

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

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

%N n-th (starting from the left) decimal digit of 11^n.

%H Andrew Howroyd, <a href="/A118943/b118943.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = floor(11^n / 10^floor(1 + log(11^n)/log(10) - n)) mod 10. - _Andrew Howroyd_, Feb 11 2018

%t Table[IntegerDigits[11^n][[n]],{n,99}]

%o (PARI) a(n) = digits(11^n)[n]; \\ _Andrew Howroyd_, Feb 11 2018

%o (PARI) a(n) = my(v=11^n); v \ 10^(1+logint(v, 10)-n) % 10; \\ _Andrew Howroyd_, Feb 11 2018

%Y Cf. A118944, A118945, A118946, A118947, A118948.

%K base,nonn

%O 1,2

%A _Zak Seidov_, May 06 2006