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Jacobsthal numbers A001045 mod 9.
1

%I #10 Dec 12 2023 08:04:26

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

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

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

%N Jacobsthal numbers A001045 mod 9.

%C Period length 18. [Proof from A001045(n)=87381*A001045(n-17)+87382*A001045(n-18), where 87381 == 0 (mod 9) and 87382 == 1 (mod 9).] [From _R. J. Mathar_, Feb 06 2009]

%Y Cf. A001045. [From _Dmitry Kamenetsky_, Feb 06 2009]

%K nonn,easy

%O 0,4

%A _Paul Curtz_, Feb 03 2009

%E Extended by _R. J. Mathar_ and _Dmitry Kamenetsky_, Feb 06 2009