A138180 - cp's OEIS frontend

A138180 Irregular triangle read by rows: row n consists of all numbers x such that x and x+1 have no prime factor larger than prime(n).

n	a(n)
1	1
2	1
3	2
4	3
5	8
6	1
7	2
8	3
9	4
10	5
11	8
12	9
13	15
14	24
15	80
16	1
17	2
18	3
19	4
20	5
21	6
22	7
23	8
24	9
25	14
26	15
27	20
28	24
29	27
30	35
31	48
32	49
33	63
34	80
35	125
36	224
37	2400
38	4374
39	1
40	2
41	3
42	4
43	5
44	6
45	7
46	8
47	9
48	10
49	11
50	14
51	15
52	20
53	21
54	24
55	27
56	32
57	35
58	44
59	48
60	49
61	54
62	55
63	63
64	80
65	98
66	99
67	120
68	125
69	175
70	224
71	242
72	384
73	440
74	539

[1, 1, 2, 3, 8, 1, 2, 3, 4, 5, 8, 9, 15, 24, 80, 1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 20, 24, 27, 35, 48, 49, 63, 80, 125, 224, 2400, 4374, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 20, 21, 24, 27, 32, 35, 44, 48, 49, 54, 55, 63, 80, 98, 99, 120, 125, 175, 224, 242, 384, 440, 539]

cp's OEIS Frontend

A138180 Irregular triangle read by rows: row n consists of all numbers x such that x and x+1 have no prime factor larger than prime(n).

Table of values

List of values