A140223 Triangle: Row n contains (d(1),d(2),...,d(n)) in non-descending order, where d(n) = A000005(n).

1, 1, 2, 1, 2, 2, 1, 2, 2, 3, 1, 2, 2, 2, 3, 1, 2, 2, 2, 3, 4, 1, 2, 2, 2, 2, 3, 4, 1, 2, 2, 2, 2, 3, 4, 4, 1, 2, 2, 2, 2, 3, 3, 4, 4, 1, 2, 2, 2, 2, 3, 3, 4, 4, 4, 1, 2, 2, 2, 2, 2, 3, 3, 4, 4, 4, 1, 2, 2, 2, 2, 2, 3, 3, 4, 4, 4, 6, 1, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 4, 6, 1, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 4, 4, 6

Offset

1,3

Links

Table of n, a(n) for n=1..105.

Example

The sequence of the numbers of divisors of the first 12 positive integers is: 1,2,2,3,2,4,2,4,3,4,2,6.
Rearranging these into a non-descending sequence gets row-12 of the triangle: 1,2,2,2,2,2,3,3,4,4,4,6.

Crossrefs

Cf. A000005, A140224, A140225.

Sequence in context: A007895 A053260 A267135 * A308694 A280521 A278043

Adjacent sequences: A140220 A140221 A140222 * A140224 A140225 A140226

Keyword

nonn,tabl

Author

Leroy Quet, May 12 2008

Extensions

Extended by Ray Chandler, Jun 26 2009

Status

approved