A004223 a(n) = 100*log_10(n) rounded to the nearest integer.

0, 30, 48, 60, 70, 78, 85, 90, 95, 100, 104, 108, 111, 115, 118, 120, 123, 126, 128, 130, 132, 134, 136, 138, 140, 141, 143, 145, 146, 148, 149, 151, 152, 153, 154, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 172, 173

Offset

1,2

Links

Zhuorui He, Table of n, a(n) for n = 1..10000

Mathematica

Round[100*Log10[Range[100]]] (* Paolo Xausa, Oct 16 2025 *)

Prog

(PARI) A004223(n) = logint(10 * n^200, 10) \ 2 \\ Zhuorui He, Oct 09 2025

Crossrefs

Cf. A004222, A004224, A002392.

Sequence in context: A281919 A004222 A207143 * A230558 A272949 A271998

Adjacent sequences: A004220 A004221 A004222 * A004224 A004225 A004226

Keyword

nonn

Author

N. J. A. Sloane

Extensions

a(45) onward from Zhuorui He, Oct 09 2025

Status

approved