A093431 - cp's OEIS frontend

A093431 a(n) = Sum_{k=1..n} (lcm(n,n-1,...,n-k+2,n-k+1)/lcm(1,2,...,k)).

n	a(n)
1	1
2	3
3	7
4	13
5	31
6	38
7	113
8	165
9	265
10	420
11	1607
12	1004
13	3979
14	6893
15	4205
16	8665
17	40903
18	49558
19	315477
20	162320
21	79179
22	269877
23	1647123
24	937552
25	1810091
26	8445653
27	7791355
28	3978237
29	33071543
30	19578860
31	283536169
32	327438713
33	117635955
34	742042966
35	154748983
36	88779588

[1, 3, 7, 13, 31, 38, 113, 165, 265, 420, 1607, 1004, 3979, 6893, 4205, 8665, 40903, 49558, 315477, 162320, 79179, 269877, 1647123, 937552, 1810091, 8445653, 7791355, 3978237, 33071543, 19578860, 283536169, 327438713, 117635955, 742042966, 154748983, 88779588]

cp's OEIS Frontend

A093431 a(n) = Sum_{k=1..n} (lcm(n,n-1,...,n-k+2,n-k+1)/lcm(1,2,...,k)).

Table of values

List of values