A276799 a(n) = floor(n*t^2) - A003145(n), where t = 1.8392867... is the tribonacci constant A058265.

1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 2, 1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 2, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 1

Offset

1,29

Comments

a(n) is in {-1, 0, 1, 2}, but the first n for which -1 appears is n = 329. - Jeffrey Shallit, Nov 19 2016

Links

N. J. A. Sloane, Table of n, a(n) for n = 1..10000

Formula

a(n) = A277722(n) - A003145(n). - R. J. Mathar, Nov 02 2016

Crossrefs

Cf. A003144, A003145, A003146, A275926, A058265, A276800, A277721, A278352 (positions of -1's).

Sequence in context: A305053 A374081 A353454 * A353423 A037907 A365167

Adjacent sequences: A276796 A276797 A276798 * A276800 A276801 A276802

Keyword

sign

Author

N. J. A. Sloane, Oct 28 2016

Status

approved