A076521 a(n) = floor( (n/2)*log_2(2*n/3) ).

0, 1, 2, 4, 6, 7, 9, 11, 13, 15, 18, 20, 22, 24, 27, 29, 32, 34, 37, 39, 42, 45, 48, 50, 53, 56, 59, 61, 64, 67, 70, 73, 76, 79, 82, 85, 88, 91, 94, 97, 100, 104, 107, 110, 113, 116, 120, 123, 126, 129, 133, 136, 139, 142, 146, 149, 152, 156, 159, 163, 166, 169, 173, 176, 180

Offset

2,3

Links

Table of n, a(n) for n=2..66.

A. Beygelzimer and S. Radziszowski, On halving line arrangements, Discrete Math., 257 (2002), 267-283.

Mathematica

Table[Floor[n/2 Log2[(2n)/3]], {n, 2, 70}] (* Harvey P. Dale, May 28 2020 *)

Crossrefs

Cf. A076522.

Sequence in context: A184585 A287113 A278039 * A206910 A375496 A139529

Adjacent sequences: A076518 A076519 A076520 * A076522 A076523 A076524

Keyword

nonn

Author

N. J. A. Sloane, Oct 18 2002

Extensions

a(24) corrected by Sean A. Irvine, Apr 07 2025

Status

approved