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A340792
List in which n appears ceiling(d(n)/2) = A038548(n) times, where d(n) is the number of divisors of n.
3
1, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, 10, 10, 11, 12, 12, 12, 13, 14, 14, 15, 15, 16, 16, 16, 17, 18, 18, 18, 19, 20, 20, 20, 21, 21, 22, 22, 23, 24, 24, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 28, 29, 30, 30, 30, 30, 31, 32, 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 36
OFFSET
1,2
COMMENTS
The numbers in A075362 arranged in numerical order.
FORMULA
T(n,k) = A161906(n,k) * A340791(n,k).
EXAMPLE
Array begins:
1
2
3
4 4
5
6 6
7
8 8
9 9
10 10
11
12 12 12
13
14 14
15 15
16 16 16
17
18 18 18
19
20 20 20
21 21
22 22
23
24 24 24 24
PROG
(PARI) row(n) = my(d=divisors(n), r1=select(x->(x<=sqrt(n)), d), r2=Vecrev(select(x->(x>=sqrt(n)), d))); vector(#r1, k, r1[k]*r2[k]); \\ Michel Marcus, Jan 22 2021
CROSSREFS
Cf. A038548 (row lengths), A075362, A161906, A340791, A061017 (comparable array).
Sequence in context: A099801 A099802 A196266 * A112232 A168389 A039708
KEYWORD
nonn,tabf
AUTHOR
Charles Kusniec, Jan 21 2021
STATUS
approved