A053844 (Sum of digits of n written in base 9) modulo 9.

0, 1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8, 0, 2, 3, 4, 5, 6, 7, 8, 0, 1, 3, 4, 5, 6, 7, 8, 0, 1, 2, 4, 5, 6, 7, 8, 0, 1, 2, 3, 5, 6, 7, 8, 0, 1, 2, 3, 4, 6, 7, 8, 0, 1, 2, 3, 4, 5, 7, 8, 0, 1, 2, 3, 4, 5, 6, 8, 0, 1, 2, 3, 4, 5, 6, 7, 1, 2, 3, 4, 5, 6, 7, 8, 0, 2, 3, 4, 5, 6, 7, 8, 0, 1, 3, 4, 5, 6, 7, 8

Offset: 0

Author

Henry Bottomley, Mar 28 2000

Keywords

• base
• nonn

Links

• Paolo Xausa, Table of n, a(n) for n = 0..10000
• Robert Walker, Self Similar Sloth Canon Number Sequences

Crossrefs

Eighth row of the array in A141803.

Cf. A010878, A053830.

Cf. A010060, A053837-A053843.

Programs

Mathematica

Mod[DigitSum[Range[0, 100], 9], 9] (* Paolo Xausa, Aug 09 2024 *)

Formula

a(n) = A010878(A053830(n)). - Paolo Xausa, Aug 09 2024