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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.
3
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
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
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Feb 24 2017
STATUS
approved