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A363249 Leading digit of 9^n. 4
1, 9, 8, 7, 6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 9, 8, 7, 7, 6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 9, 8, 7, 7, 6, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 9, 8, 7, 6, 6, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 9, 8, 7, 6, 6, 5, 4, 4, 4, 3, 3, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
FORMULA
a(n) = A000030(A001019(n)).
a(n) = A060956(2*n).
MATHEMATICA
a[n_] := IntegerDigits[9^n][[1]]; Array[a, 100, 0] (* Amiram Eldar, Jul 15 2023 *)
PROG
(PARI) a(n) = digits(9^n)[1];
CROSSREFS
Cf. A008952, A060956, A111395, A362871, A363093, A364185.
Cf. A000030, A001019, A008570.
Sequence in context: A342115 A090671 A132673 * A107927 A019890 A066666
Adjacent sequences: A363246 A363247 A363248 * A363250 A363251 A363252
KEYWORD
nonn,base,easy
AUTHOR
Seiichi Manyama, Jul 15 2023
STATUS
approved

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Last modified August 29 21:13 EDT 2024. Contains 375518 sequences. (Running on oeis4.)