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 A004494 Tersum n + 5. 0

%I

%S 5,3,4,8,6,7,2,0,1,14,12,13,17,15,16,11,9,10,23,21,22,26,24,25,20,18,

%T 19,32,30,31,35,33,34,29,27,28,41,39,40,44,42,43,38,36,37,50,48,49,53,

%U 51,52,47,45,46,59,57,58,62

%N Tersum n + 5.

%F Tersum m + n : write m and n in base 3 and add mod 3 with no carries, e.g. 5 + 8 = "21" + "22" = "10" = 1.

%F a(n)= -8 + Sum_{k=0..n}{(1/36)*(-47*(k mod 9)-11*((k+1) mod 9)-11*((k+2) mod 9)+25*((k+3) mod 9)-11*((k+4) mod 9)+25*((k+5) mod 9)-11*((k+6) mod 9)-11*((k+7) mod 9)+61*((k+8) mod 9)},with n>=0 - _Paolo P. Lava_, Dec 03 2007

%K nonn

%O 0,1

%A _N. J. A. Sloane_.

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Last modified June 19 00:55 EDT 2019. Contains 324217 sequences. (Running on oeis4.)