A362871 Leading digit of 6^n.

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

Offset: 0

Author

Seiichi Manyama, Jul 15 2023

Keywords

• nonn
• base
• easy

Crossrefs

Cf. A008952, A060956, A111395, A363093, A363249, A364185.

Cf. A000030, A000400, A008567.

Programs

Mathematica

a[n_] := IntegerDigits[6^n][[1]]; Array[a, 100, 0] (* Amiram Eldar, Jul 15 2023 *)

PARI

a(n) = digits(6^n)[1];

Formula

a(n) = A000030(A000400(n)).