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

Author

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

Keywords

• easy
• nonn

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

Crossrefs

Cf. A106036, A116178, A138671.

Formula

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

Extensions

More terms from Sean A. Irvine, Jul 19 2022