A282903 Concatenation of elements of P{d_1}, P{d_2}, P{d_3}, ..., P{d_n}; where P{d_n} denote the power set of the set of divisors of n ordered by the size of the subsets, and in each subset, following the increasing order.

1, 1, 2, 1, 2, 1, 3, 1, 3, 1, 2, 4, 1, 2, 1, 4, 2, 4, 1, 2, 4, 1, 5, 1, 5, 1, 2, 3, 6, 1, 2, 1, 3, 1, 6, 2, 3, 2, 6, 3, 6, 1, 2, 3, 1, 2, 6, 1, 3, 6, 2, 3, 6, 1, 2, 3, 6, 1, 7, 1, 7, 1, 2, 4, 8, 1, 2, 1, 4, 1, 8, 2, 4, 2, 8, 4, 8, 1, 2, 4, 1, 2, 8, 1, 4, 8, 2

Offset

1,3

Links

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

Example

Rows with power sets of divisors of n (without nonempty sets):
{1};
{1}, {2}, {1, 2};
{1}, {3}, {1, 3};
{1}, {2}, {4}, {1, 2}, {1, 4}, {2, 4}, {1, 2, 4};
{1}, {5}, {1, 5};
...
Concatenation: 1, 1, 2, 1, 2, 1, 3, 1, 3, ...

Crossrefs

Cf. A193360 (concatenation of P{1..n}).

Sequence in context: A232440 A355749 A278538 * A332677 A090329 A224876

Adjacent sequences: A282900 A282901 A282902 * A282904 A282905 A282906

Keyword

nonn

Author

Jaroslav Krizek, Feb 24 2017

Status

approved