A326989 Triangle read by rows in which row n lists the nonpowers of 2 dividing n, or 0 if n is a power of 2.

0, 0, 3, 0, 5, 3, 6, 7, 0, 3, 9, 5, 10, 11, 3, 6, 12, 13, 7, 14, 3, 5, 15, 0, 17, 3, 6, 9, 18, 19, 5, 10, 20, 3, 7, 21, 11, 22, 23, 3, 6, 12, 24, 5, 25, 13, 26, 3, 9, 27, 7, 14, 28, 29, 3, 5, 6, 10, 15, 30, 31, 0, 3, 11, 33, 17, 34, 5, 7, 35, 3, 6, 9, 12, 18, 36, 37, 19, 38, 3, 13, 39, 5, 10, 20, 40, 41

Offset: 1

Author

Omar E. Pol, Aug 24 2019

Keywords

• nonn
• tabf
• easy

Comments

Row n has length A326987(n) if n is not a power of 2, otherwise row n has length 1.

Examples

			Triangle begins:
   0;
   0;
   3;
   0;
   5;
   3,  6;
   7;
   0;
   3,  9;
   5, 10;
  11;
   3,  6, 12;
  13;
   7, 14;
   3,  5, 15;
   0;
  17;
   3,  6,  9, 18;
  ...
For n = 18 the divisors of 18 are [1, 2, 3, 6, 9, 18]. There are four divisors of 18 that are not powers of 2, they are [3, 6, 9, 18], the same as the 18th row of triangle.
		

Crossrefs

Row sums give A326988.

Cf. A000079, A027750, A057716, A326987.