cp's OEIS Frontend

A233772 Triangle read by rows in which row n lists n together with the proper divisors of n multiplied by -1 in increasing order.

%I A233772 #7 Jan 14 2014 12:16:01
%S A233772 1,2,-1,3,-1,4,-2,-1,5,-1,6,-3,-2,-1,7,-1,8,-4,-2,-1,9,-3,-1,10,-5,-2,
%T A233772 -1,11,-1,12,-6,-4,-3,-2,-1,13,-1,14,-7,-2,-1,15,-5,-3,-1,16,-8,-4,-2,
%U A233772 -1,17,-1
%N A233772 Triangle read by rows in which row n lists n together with the proper divisors of n multiplied by -1 in increasing order.
%C A233772 The same as A056538 but with all terms multiplied by -1 from the second column.
%C A233772 The sum of row n gives the deficiency of n.
%e A233772 Written as an irregular triangle in which row n has length A000005(n) the sequence begins:
%e A233772 1;
%e A233772 2, -1;
%e A233772 3, -1;
%e A233772 4, -2, -1;
%e A233772 5, -1;
%e A233772 6, -3, -2, -1;
%e A233772 7, -1;
%e A233772 8, -4, -2, -1;
%e A233772 9, -3, -1;
%e A233772 10, -5, -2, -1;
%e A233772 11, -1;
%e A233772 12, -6, -4, -3, -2, -1;
%e A233772 ...
%Y A233772 Row sums give A033879.
%Y A233772 Cf. A000005, A000203, A000396, A001065, A005100, A005101, A027750, A033880, A056538, A233773.
%K A233772 sign,tabf
%O A233772 1,2
%A A233772 _Omar E. Pol_, Jan 03 2014