login
Triangle T(n,k): T(n,k) = phi(k) (n >= 1, 1 <= k <= n).
0

%I #10 May 04 2019 23:09:36

%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