A027748 - cp's OEIS frontend

A027748 Irregular triangle in which first row is 1, n-th row (n > 1) lists distinct prime factors of n.

n	a(n)
1	1
2	2
3	3
4	2
5	5
6	2
7	3
8	7
9	2
10	3
11	2
12	5
13	11
14	2
15	3
16	13
17	2
18	7
19	3
20	5
21	2
22	17
23	2
24	3
25	19
26	2
27	5
28	3
29	7
30	2
31	11
32	23
33	2
34	3
35	5
36	2
37	13
38	3
39	2
40	7
41	29
42	2
43	3
44	5
45	31
46	2
47	3
48	11
49	2
50	17
51	5
52	7
53	2
54	3
55	37
56	2
57	19
58	3
59	13
60	2
61	5
62	41
63	2
64	3
65	7
66	43
67	2
68	11
69	3
70	5
71	2
72	23
73	47
74	2
75	3
76	7
77	2
78	5
79	3
80	17
81	2
82	13
83	53
84	2
85	3
86	5
87	11
88	2
89	7
90	3
91	19
92	2
93	29
94	59
95	2
96	3
97	5
98	61
99	2
100	31

[1, 2, 3, 2, 5, 2, 3, 7, 2, 3, 2, 5, 11, 2, 3, 13, 2, 7, 3, 5, 2, 17, 2, 3, 19, 2, 5, 3, 7, 2, 11, 23, 2, 3, 5, 2, 13, 3, 2, 7, 29, 2, 3, 5, 31, 2, 3, 11, 2, 17, 5, 7, 2, 3, 37, 2, 19, 3, 13, 2, 5, 41, 2, 3, 7, 43, 2, 11, 3, 5, 2, 23, 47, 2, 3, 7, 2, 5, 3, 17, 2, 13, 53, 2, 3, 5, 11, 2, 7, 3, 19, 2, 29, 59, 2, 3, 5, 61, 2, 31]

cp's OEIS Frontend

A027748 Irregular triangle in which first row is 1, n-th row (n > 1) lists distinct prime factors of n.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	2
5	5
6	2
7	3
8	7
9	2
10	3
11	2
12	5
13	11
14	2
15	3
16	13
17	2
18	7
19	3
20	5
21	2
22	17
23	2
24	3
25	19
26	2
27	5
28	3
29	7
30	2
31	11
32	23
33	2
34	3
35	5
36	2
37	13
38	3
39	2
40	7
41	29
42	2
43	3
44	5
45	31
46	2
47	3
48	11
49	2
50	17
51	5
52	7
53	2
54	3
55	37
56	2
57	19
58	3
59	13
60	2
61	5
62	41
63	2
64	3
65	7
66	43
67	2
68	11
69	3
70	5
71	2
72	23
73	47
74	2
75	3
76	7
77	2
78	5
79	3
80	17
81	2
82	13
83	53
84	2
85	3
86	5
87	11
88	2
89	7
90	3
91	19
92	2
93	29
94	59
95	2
96	3
97	5
98	61
99	2
100	31

n	a(n)
1	1
2	2
3	3
4	2
5	5
6	2
7	3
8	7
9	2
10	3
11	2
12	5
13	11
14	2
15	3
16	13
17	2
18	7
19	3
20	5
21	2
22	17
23	2
24	3
25	19
26	2
27	5
28	3
29	7
30	2
31	11
32	23
33	2
34	3
35	5
36	2
37	13
38	3
39	2
40	7
41	29
42	2
43	3
44	5
45	31
46	2
47	3
48	11
49	2
50	17
51	5
52	7
53	2
54	3
55	37
56	2
57	19
58	3
59	13
60	2
61	5
62	41
63	2
64	3
65	7
66	43
67	2
68	11
69	3
70	5
71	2
72	23
73	47
74	2
75	3
76	7
77	2
78	5
79	3
80	17
81	2
82	13
83	53
84	2
85	3
86	5
87	11
88	2
89	7
90	3
91	19
92	2
93	29
94	59
95	2
96	3
97	5
98	61
99	2
100	31

n	a(n)
1	1
2	2
3	3
4	2
5	5
6	2
7	3
8	7
9	2
10	3
11	2
12	5
13	11
14	2
15	3
16	13
17	2
18	7
19	3
20	5
21	2
22	17
23	2
24	3
25	19
26	2
27	5
28	3
29	7
30	2
31	11
32	23
33	2
34	3
35	5
36	2
37	13
38	3
39	2
40	7
41	29
42	2
43	3
44	5
45	31
46	2
47	3
48	11
49	2
50	17
51	5
52	7
53	2
54	3
55	37
56	2
57	19
58	3
59	13
60	2
61	5
62	41
63	2
64	3
65	7
66	43
67	2
68	11
69	3
70	5
71	2
72	23
73	47
74	2
75	3
76	7
77	2
78	5
79	3
80	17
81	2
82	13
83	53
84	2
85	3
86	5
87	11
88	2
89	7
90	3
91	19
92	2
93	29
94	59
95	2
96	3
97	5
98	61
99	2
100	31