A143613 - OEIS

%I #8 Jun 05 2023 07:07:07

%S 1,2,0,2,2,0,3,0,3,0,2,2,3,4,0,4,2,0,0,5,0,2,2,3,4,5,6,0,4,0,6,0,5,0,

%T 7,0,3,4,0,4,5,0,7,8,0,4,2,6,4,0,0,7,0,9,0,2,2,3,4,5,6,7,8,9,10,0,6,2,

%U 3,0,10,0,7,0,0,0,11,0,2,2,3,4,5,6,7,8,9,10,11,12,0

%N Triangle read by rows: A051731 * A127368.

%C A051731 = the inverse Moebius transform.

%C A127368 records the reduced residue system mod n, by rows.

%C Left border = d(n).

%C Row sums = A057661: (1, 2, 4, 6, 11, 11, 22, 22, 31, ...).

%e First few rows of the triangle;

%e   1;

%e   2, 0;

%e   2, 2, 0;

%e   3, 0, 3, 0;

%e   2, 2, 3, 4, 0;

%e   4, 2, 0, 0, 5, 0;

%e   2, 2, 3, 4, 5, 6, 0;

%e   ...

%Y Cf. A000005, A051731, A057661, A127368.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Aug 27 2008

%E a(78) = 0 inserted by _Georg Fischer_, Jun 05 2023