A333996 - cp's OEIS frontend

A333996 Number of composite numbers in the triangular n X n multiplication table.

n	a(n)
1	0
2	1
3	3
4	7
5	11
6	17
7	23
8	31
9	40
10	50
11	60
12	72
13	84
14	98
15	113
16	129
17	145
18	163
19	181
20	201
21	222
22	244
23	266
24	290
25	315
26	341
27	368
28	396
29	424
30	454
31	484
32	516
33	549
34	583
35	618
36	654
37	690
38	728
39	767
40	807
41	847
42	889
43	931
44	975
45	1020
46	1066
47	1112
48	1160
49	1209
50	1259
51	1310
52	1362
53	1414

[0, 1, 3, 7, 11, 17, 23, 31, 40, 50, 60, 72, 84, 98, 113, 129, 145, 163, 181, 201, 222, 244, 266, 290, 315, 341, 368, 396, 424, 454, 484, 516, 549, 583, 618, 654, 690, 728, 767, 807, 847, 889, 931, 975, 1020, 1066, 1112, 1160, 1209, 1259, 1310, 1362, 1414]

cp's OEIS Frontend

A333996 Number of composite numbers in the triangular n X n multiplication table.

Table of values

List of values