A280426 Digital roots of tetranacci numbers A000078.

0, 0, 0, 1, 1, 2, 4, 8, 6, 2, 2, 9, 1, 5, 8, 5, 1, 1, 6, 4, 3, 5, 9, 3, 2, 1, 6, 3, 3, 4, 7, 8, 4, 5, 6, 5, 2, 9, 4, 2, 8, 5, 1, 7, 3, 7, 9, 8, 9, 6, 5, 1, 3, 6, 6, 7, 4, 5, 4, 2, 6, 8, 2, 9, 7, 8, 8, 5, 1, 4, 9, 1, 6, 2, 9, 9, 8, 1, 9, 9, 9, 1, 1, 2, 4, 8, 6, 2

Offset: 0

Author

Peter M. Chema, Jan 02 2017

Keywords

• nonn
• base

Comments

From a(3) onwards, periodic with period length 78, twice the periodicity of the digital roots of tribonacci numbers A222407 (also the 12th triangular number).

Crossrefs

Cf. A000078, A010888, A222407.

Formula

a(n) = A010888(A000078(n)).