A178776 - cp's OEIS frontend

A178776 a(n) is the largest number that appears twice in an n x n multiplication table of positive integers, disregarding the pairs that are obviously produced by the commutative property.

n	a(n)
4	4
5	4
6	12
7	12
8	24
9	36
10	40
11	40
12	72
13	72
14	84
15	120
16	144
17	144
18	180
19	180
20	240
21	252
22	252
23	252
24	360
25	400
26	400
27	432
28	504
29	504
30	600
31	600
32	672
33	672
34	672
35	840
36	900
37	900
38	900
39	936
40	1120
41	1120
42	1260
43	1260
44	1320
45	1440
46	1440
47	1440
48	1680
49	1764
50	1800
51	1800
52	1872
53	1872

[4, 4, 12, 12, 24, 36, 40, 40, 72, 72, 84, 120, 144, 144, 180, 180, 240, 252, 252, 252, 360, 400, 400, 432, 504, 504, 600, 600, 672, 672, 672, 840, 900, 900, 900, 936, 1120, 1120, 1260, 1260, 1320, 1440, 1440, 1440, 1680, 1764, 1800, 1800, 1872, 1872]

cp's OEIS Frontend

A178776 a(n) is the largest number that appears twice in an n x n multiplication table of positive integers, disregarding the pairs that are obviously produced by the commutative property.

Table of values

List of values