A388419 Harmonic mean of the positive integers with n decimal digits, rounded to nearest integer.

3, 38, 390, 3908, 39086, 390864, 3908650, 39086503, 390865033, 3908650336, 39086503371

Offset

1,1

Links

Table of n, a(n) for n=1..11.

Formula

Limit_{n->oo} A334388*a(n)/10^n = 1.

Mathematica

a[n_]:=Round[HarmonicMean[Range[10^(n-1), 10^n-1]]]; Array[a, 6] (* James C. McMahon, Sep 18 2025 *)

Crossrefs

Cf. A002387, A052268, A334388, A388420, A388421.

Sequence in context: A050394 A281798 A156071 * A199025 A265914 A005780

Adjacent sequences: A388416 A388417 A388418 * A388420 A388421 A388422

Keyword

nonn,base,more

Author

Hugo Pfoertner, Sep 18 2025

Status

approved