%I
%S 1,1,1,1,1,2,1,1,2,2,1,1,2,2,4,1,1,2,2,4,2,1,1,2,2,4,2,6,1,1,2,2,4,2,
%T 6,4,1,1,2,2,4,2,6,4,6,1,1,2,2,4,2,6,4,6,4,1,1,2,2,4,2,6,4,6,4,10,1,1,
%U 2,2,4,2,6,4,6,4,10,4,1,1,2,2,4,2,6,4,6,4,10,4,12
%N Triangle T(n,k): T(n,k) = phi(k) (n >= 1, 1 <= k <= n).
%p seq(seq(phi(k), k=1..n), n=0..13); # _Zerinvary Lajos_, Oct 07 2007
%Y Cf. A054521.
%K nonn,tabl
%O 1,6
%A _N. J. A. Sloane_, Apr 09 2000
