A337655 - cp's OEIS frontend

A337655 a(1)=1; thereafter, a(n) is the smallest number such that both the addition and multiplication tables for (a(1),...,a(n)) contain n*(n+1)/2 different entries (the maximum possible).

n	a(n)
1	1
2	2
3	5
4	7
5	15
6	22
7	31
8	50
9	68
10	90
11	101
12	124
13	163
14	188
15	215
16	253
17	322
18	358
19	455
20	486
21	527
22	631
23	702
24	780
25	838
26	920
27	1030
28	1062
29	1197
30	1289
31	1420
32	1500
33	1689
34	1765
35	1886
36	2114
37	2353
38	2410
39	2570
40	2686
41	2857
42	3063
43	3207
44	3477
45	3616
46	3845
47	3951
48	4150
49	4480
50	4595
51	4746
52	5030
53	5286
54	5698
55	5999
56	6497
57	6624
58	6938
59	7219
60	7661
61	7838
62	8469
63	8665
64	9198
65	9351
66	9667
67	9966

[1, 2, 5, 7, 15, 22, 31, 50, 68, 90, 101, 124, 163, 188, 215, 253, 322, 358, 455, 486, 527, 631, 702, 780, 838, 920, 1030, 1062, 1197, 1289, 1420, 1500, 1689, 1765, 1886, 2114, 2353, 2410, 2570, 2686, 2857, 3063, 3207, 3477, 3616, 3845, 3951, 4150, 4480, 4595, 4746, 5030, 5286, 5698, 5999, 6497, 6624, 6938, 7219, 7661, 7838, 8469, 8665, 9198, 9351, 9667, 9966]

cp's OEIS Frontend

A337655 a(1)=1; thereafter, a(n) is the smallest number such that both the addition and multiplication tables for (a(1),...,a(n)) contain n*(n+1)/2 different entries (the maximum possible).

Table of values

List of values