A118943 - OEIS

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A118943

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

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, 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, 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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = floor(11^n / 10^floor(1 + log(11^n)/log(10) - n)) mod 10. - Andrew Howroyd, Feb 11 2018

MATHEMATICA

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

PROG

(PARI) a(n) = digits(11^n)[n]; \\ Andrew Howroyd, Feb 11 2018

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