A138670 Indices of 0's in Stewart's choral sequence.

0, 1, 3, 4, 6, 9, 10, 12, 13, 15, 18, 19, 21, 24, 27, 28, 30, 31, 33, 36, 37, 39, 40, 42, 45, 46, 48, 51, 54, 55, 57, 58, 60, 63, 64, 66, 69, 72, 73, 75, 78, 81, 82, 84, 85, 87, 90, 91, 93, 94, 96, 99, 100, 102, 105, 108, 109, 111, 112, 114, 117, 118, 120, 121

Offset

0,3

Comments

Conjecture: essentially partial sums of A106036 (verified for n <= 10000). - Sean A. Irvine, Jul 19 2022

Links

Sean A. Irvine, Table of n, a(n) for n = 0..9999

Formula

The set {k*3^(m+1) + (3^m-1)/2 with k >= 0 and m >= 1}.

Crossrefs

Cf. A106036, A116178, A138671.

Sequence in context: A102342 A286692 A014419 * A080336 A082692 A032706

Adjacent sequences: A138667 A138668 A138669 * A138671 A138672 A138673

Keyword

easy,nonn

Author

Joel Reyes Noche (joel.noche(AT)up.edu.ph), Mar 26 2008

Extensions

More terms from Sean A. Irvine, Jul 19 2022

Status

approved