A280738 - cp's OEIS frontend

A280738 After S(n)=A280864(n) has been computed, let p(n) = product of distinct primes shared by S(n-1) and S(n); let q(n) = product of distinct primes in S(n) but not in S(n-1); and let r(n) = smallest number not yet in S. Sequence gives p(n).

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

[1, 1, 2, 1, 3, 2, 1, 5, 2, 3, 1, 7, 2, 1, 11, 2, 3, 5, 2, 3, 7, 2, 13, 1, 17, 2, 15, 1, 19, 2, 1, 23, 2, 3, 1, 5, 7, 6, 1, 29, 2, 5, 11, 3, 13, 2, 11, 7, 1, 31, 2, 5, 13, 6, 1, 37, 2, 7, 3, 17, 2, 15, 1, 41, 2, 1, 43, 2, 33, 1, 47, 2, 35, 3, 19, 2, 3, 23, 2, 5]

cp's OEIS Frontend

A280738 After S(n)=A280864(n) has been computed, let p(n) = product of distinct primes shared by S(n-1) and S(n); let q(n) = product of distinct primes in S(n) but not in S(n-1); and let r(n) = smallest number not yet in S. Sequence gives p(n).

Table of values

List of values

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

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

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