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%I #11 Jul 01 2020 14:35:16
%S 0,6,3,18,6,30,9,42,12,54,15,66,18,78,21,90,24,102,27,114,30,126,33,
%T 138,36,150,39,162,42,174,45,186,48,198,51,210,54,222,57,234,60,246,
%U 63,258,66,270,69,282,72,294,75,306,78,318,81,330,84,342,87,354,90,366,93,378,96
%N a(n) = 3 * A064680(n).
%F a(n) = A064680(3*n), similar to A165988.
%F a(n) mod 9 = 3*A080425(n) (period length 3).
%F a(2n+1) = A017593(n).
%F a(2n) = A008585(n).
%Y Cf. A008585, A017593, A064680, A080425, A165988.
%K nonn,easy
%O 0,2
%A _Paul Curtz_, Mar 05 2010
%E a(0) = 0 prepended by _Georg Fischer_, Jul 01 2020
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