A226190 - OEIS

A226190

Least positive integer k such that 1 + 1/2 + ... + 1/k >= log(n).

1, 1, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 7, 8, 8, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 15, 15, 16, 16, 17, 17, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25, 25, 26, 26, 27, 28, 28, 29, 29, 30, 30, 31, 31, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 38, 38, 39, 39, 40, 40, 41, 42, 42, 43, 43, 44, 44, 45

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OFFSET

1,3

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..1000

EXAMPLE

a(9) = 5 because 1 + 1/2 + 1/3 + 1/4 < log(9) < 1 + 1/2 + 1/3 + 1/4 + 1/5.

MATHEMATICA

z = 80; f[n_] := 1/n; Do[s = 0; a[n] = NestWhile[# + 1 &, 1, ! (s += f[#]) > Log[n] &], {n, 1, z}]; m = Map[a, Range[z]]

CROSSREFS

Cf. A226183, A226189, A004081.

Sequence in context: A194204 A348110 A100679 * A195182 A225875 A189688

Adjacent sequences: A226187 A226188 A226189 * A226191 A226192 A226193

KEYWORD

nonn

AUTHOR

Clark Kimberling, May 30 2013

STATUS

approved