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

1,3

Comments

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

Links

Table of n, a(n) for n=1..87.

Example

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.

Sequence in context: A291503 A108500 A322937 * A326937 A336597 A076109

Adjacent sequences: A326986 A326987 A326988 * A326990 A326991 A326992

Keyword

nonn,tabf,easy

Author

Omar E. Pol, Aug 24 2019

Status

approved