A377774 - cp's OEIS frontend

A377774 a(n) = largest prime p < gpf(n) that does not divide n, or p = nextprime(gpf(n)) for n in A055932, where gpf = A006530.

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

[2, 3, 2, 3, 3, 5, 5, 3, 2, 3, 7, 5, 11, 5, 2, 3, 13, 5, 17, 3, 5, 7, 19, 5, 3, 11, 2, 5, 23, 7, 29, 3, 7, 13, 3, 5, 31, 17, 11, 3, 37, 5, 41, 7, 2, 19, 43, 5, 5, 3, 13, 11, 47, 5, 7, 5, 17, 23, 53, 7, 59, 29, 5, 3, 11, 7, 61, 13, 19, 3, 67, 5, 71, 31, 2, 17, 5]

cp's OEIS Frontend

A377774 a(n) = largest prime p < gpf(n) that does not divide n, or p = nextprime(gpf(n)) for n in A055932, where gpf = A006530.

Table of values

List of values

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

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

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