A189100 - cp's OEIS frontend

A189100 a(n) = lcm(n!,n!')/gcd(n!,n!'), where n!' is the arithmetic derivative of n! (A068311).

n	a(n)
1	0
2	2
3	30
4	66
5	1830
6	645
7	33180
8	198870
9	228270
10	64785
11	7960260
12	9738960
13	1663226565
14	7232635410
15	857066210
16	1057466410
17	307311194190
18	767464487790
19	278292627277665
20	306517823106495
21	35302033071305
22	147385363695570
23	78207294248313230
24	198777858520921680

[0, 2, 30, 66, 1830, 645, 33180, 198870, 228270, 64785, 7960260, 9738960, 1663226565, 7232635410, 857066210, 1057466410, 307311194190, 767464487790, 278292627277665, 306517823106495, 35302033071305, 147385363695570, 78207294248313230, 198777858520921680]

cp's OEIS Frontend

A189100 a(n) = lcm(n!,n!')/gcd(n!,n!'), where n!' is the arithmetic derivative of n! (A068311).

Table of values

List of values