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

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, -1, 11, -1, 12, -6, -4, -3, -2, -1, 13, -1, 14, -7, -2, -1, 15, -5, -3, -1, 16, -8, -4, -2, -1, 17, -1

Offset

1,2

Comments

The same as A056538 but with all terms multiplied by -1 from the second column.

The sum of row n gives the deficiency of n.

Links

Table of n, a(n) for n=1..52.

Example

Written as an irregular triangle in which row n has length A000005(n) the sequence begins:
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, -1;
11, -1;
12, -6, -4, -3, -2, -1;
...

Crossrefs

Row sums give A033879.

Cf. A000005, A000203, A000396, A001065, A005100, A005101, A027750, A033880, A056538, A233773.

Sequence in context: A210959 A319848 A364749 * A056538 A266742 A120385

Adjacent sequences: A233769 A233770 A233771 * A233773 A233774 A233775

Keyword

sign,tabf

Author

Omar E. Pol, Jan 03 2014

Status

approved