A364185 Leading digit of 11^n.

1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 5, 5, 6, 6, 7, 8, 8, 9, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 6, 6, 7, 8, 8, 9, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 6, 7, 7, 8, 9, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 5, 5, 6, 7, 7, 8, 9, 1, 1, 1, 1

Offset

0,9

Links

Seiichi Manyama, Table of n, a(n) for n = 0..10000

Formula

a(n) = A000030(A001020(n)).

Mathematica

a[n_] := IntegerDigits[11^n][[1]]; Array[a, 100, 0] (* Amiram Eldar, Jul 15 2023 *)

Prog

(PARI) a(n) = digits(11^n)[1];

Crossrefs

Cf. A008952, A060956, A111395, A362871, A363093, A363249.

Cf. A000030, A001020, A008571.

Sequence in context: A029280 A060971 A283422 * A091946 A094996 A120194

Adjacent sequences: A364182 A364183 A364184 * A364186 A364187 A364188

Keyword

nonn,base,easy

Author

Seiichi Manyama, Jul 15 2023

Status

approved