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%I #7 Mar 11 2014 01:34:13
%S 1,1,1,1,0,1,1,2,0,1,1,0,0,0,1,1,2,2,0,0,1,1,0,0,0,0,0,1,1,2,0,2,0,0,
%T 0,1,1,0,3,0,0,0,0,0,1,1,2,0,0,2,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,1,1,2,
%U 3,3,0,2,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,1
%N Triangle read by rows: T(n,k)=min(k, n/k) if k divides n, T(n,k)=0 otherwise (n >=1, 1<=k<=n).
%H Omar E. Pol, <a href="http://www.polprimos.com">Determinacion geometrica de los numeros primos y perfectos</a> [From _Omar E. Pol_, Jul 20 2009]
%H Omar E. Pol, <a href="http://www.polprimos.com/imagenespub/polprdipi.jpg">Illustration: Divisors and pi(x)</a> [From _Omar E. Pol_, Jul 20 2009]
%e Triangle begins:
%e 1;
%e 1,1;
%e 1,0,1;
%e 1,2,0,1;
%e 1,0,0,0,1;
%e 1,2,2,0,0,1;
%e 1,0,0,0,0,0,1;
%e 1,2,0,2,0,0,0,1;
%e 1,0,3,0,0,0,0,0,1;
%e 1,2,0,0,2,0,0,0,0,1;
%e 1,0,0,0,0,0,0,0,0,0,1;
%e 1,2,3,3,0,2,0,0,0,0,0,1;
%e 1,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,2,0,0,0,0,2,0,0,0,0,0,0,1;
%e 1,0,3,0,3,0,0,0,0,0,0,0,0,0,1;
%e 1,2,0,4,0,0,0,2,0,0,0,0,0,0,0,1;
%e 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,2,3,0,0,3,0,0,2,0,0,0,0,0,0,0,0,1;
%e 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,2,0,4,4,0,0,0,0,2,0,0,0,0,0,0,0,0,0,1;
%e 1,0,3,0,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,2,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,1;
%e 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,2,3,4,0,4,0,3,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,2,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,0,3,0,0,0,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,2,0,4,0,0,4,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e 1,2,3,0,5,5,0,0,0,3,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1;
%e ...
%e Row sums: A117004.
%Y Cf. A000005, A008578, A027750, A051731, A117004, A127093, A161345, A161424, A161835, A162526, A162527, A162528, A162529, A162530, A162531, A162532. [From _Omar E. Pol_, Jul 20 2009]
%K nonn,tabl
%O 1,8
%A _Omar E. Pol_, Nov 16 2008, Jul 20 2009
%E Submitted without a definition, which was supplied by _Jon E. Schoenfield_, Dec 13 2008
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