A132421 - cp's OEIS frontend

A132421 a(n) = LCM of the integers b(k), over all k where 1 <= k <= n, where b(k) = the k-th integer from among those positive integers which are coprime to (n+1-k).

n	a(n)
1	1
2	2
3	3
4	20
5	420
6	90
7	1155
8	6552
9	990
10	340340
11	38798760
12	406980
13	314954640
14	30630600
15	489304530
16	18357939600
17	21649708080
18	2872543794120
19	181957885200
20	5555594444400
21	237972194460
22	32681613985020
23	378270916143120
24	892567605600
25	392636231914726800
26	1707200400597892200
27	1079806447472472720
28	4176841288170450900

[1, 2, 3, 20, 420, 90, 1155, 6552, 990, 340340, 38798760, 406980, 314954640, 30630600, 489304530, 18357939600, 21649708080, 2872543794120, 181957885200, 5555594444400, 237972194460, 32681613985020, 378270916143120, 892567605600, 392636231914726800, 1707200400597892200, 1079806447472472720, 4176841288170450900]

cp's OEIS Frontend

A132421 a(n) = LCM of the integers b(k), over all k where 1 <= k <= n, where b(k) = the k-th integer from among those positive integers which are coprime to (n+1-k).

Table of values

List of values