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

0,6

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).

Links

Table of n, a(n) for n=0..87.

Formula

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

Crossrefs

Cf. A000078, A010888, A222407.

Sequence in context: A125733 A333555 A352378 * A000689 A132137 A011180

Adjacent sequences: A280423 A280424 A280425 * A280427 A280428 A280429

Keyword

nonn,base

Author

Peter M. Chema, Jan 02 2017

Status

approved