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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 (list; graph; refs; listen; history; text; internal format)
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: A268187 A232440 A278538 * A090329 A224876 A027353

Adjacent sequences:  A282900 A282901 A282902 * A282904 A282905 A282906

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Feb 24 2017

STATUS

approved

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Last modified October 23 16:15 EDT 2018. Contains 316529 sequences. (Running on oeis4.)