A384276 - cp's OEIS frontend

A384276 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number that is coprime to a(n-1) while the total number of prime factors, counted with multiplicity, of the form 4k+1 and 4k+3 for all terms a(1)..a(n) never differs by more than 1.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	13
8	7
9	8
10	15
11	16
12	17
13	10
14	9
15	20
16	11
17	25
18	12
19	19
20	26
21	23
22	29
23	14
24	37
25	22
26	35
27	32
28	39
29	34
30	31
31	30
32	41
33	24
34	53
35	28
36	51
37	40
38	43
39	50
40	21
41	52
42	45
43	58
44	47
45	55
46	61
47	38
48	65
49	18
50	73
51	44
52	75
53	46
54	85
55	33
56	64
57	87
58	68
59	59
60	60
61	89
62	48
63	91
64	74
65	67
66	70

[1, 2, 3, 4, 5, 6, 13, 7, 8, 15, 16, 17, 10, 9, 20, 11, 25, 12, 19, 26, 23, 29, 14, 37, 22, 35, 32, 39, 34, 31, 30, 41, 24, 53, 28, 51, 40, 43, 50, 21, 52, 45, 58, 47, 55, 61, 38, 65, 18, 73, 44, 75, 46, 85, 33, 64, 87, 68, 59, 60, 89, 48, 91, 74, 67, 70]

cp's OEIS Frontend

A384276 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number that is coprime to a(n-1) while the total number of prime factors, counted with multiplicity, of the form 4k+1 and 4k+3 for all terms a(1)..a(n) never differs by more than 1.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	13
8	7
9	8
10	15
11	16
12	17
13	10
14	9
15	20
16	11
17	25
18	12
19	19
20	26
21	23
22	29
23	14
24	37
25	22
26	35
27	32
28	39
29	34
30	31
31	30
32	41
33	24
34	53
35	28
36	51
37	40
38	43
39	50
40	21
41	52
42	45
43	58
44	47
45	55
46	61
47	38
48	65
49	18
50	73
51	44
52	75
53	46
54	85
55	33
56	64
57	87
58	68
59	59
60	60
61	89
62	48
63	91
64	74
65	67
66	70

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	13
8	7
9	8
10	15
11	16
12	17
13	10
14	9
15	20
16	11
17	25
18	12
19	19
20	26
21	23
22	29
23	14
24	37
25	22
26	35
27	32
28	39
29	34
30	31
31	30
32	41
33	24
34	53
35	28
36	51
37	40
38	43
39	50
40	21
41	52
42	45
43	58
44	47
45	55
46	61
47	38
48	65
49	18
50	73
51	44
52	75
53	46
54	85
55	33
56	64
57	87
58	68
59	59
60	60
61	89
62	48
63	91
64	74
65	67
66	70

cp's OEIS Frontend

A384276 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number that is coprime to a(n-1) while the total number of prime factors, counted with multiplicity, of the form 4*k+1 and 4*k+3 for all terms a(1)..a(n) never differs by more than 1.

Table of values

List of values

A384276 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number that is coprime to a(n-1) while the total number of prime factors, counted with multiplicity, of the form 4k+1 and 4k+3 for all terms a(1)..a(n) never differs by more than 1.

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	13
8	7
9	8
10	15
11	16
12	17
13	10
14	9
15	20
16	11
17	25
18	12
19	19
20	26
21	23
22	29
23	14
24	37
25	22
26	35
27	32
28	39
29	34
30	31
31	30
32	41
33	24
34	53
35	28
36	51
37	40
38	43
39	50
40	21
41	52
42	45
43	58
44	47
45	55
46	61
47	38
48	65
49	18
50	73
51	44
52	75
53	46
54	85
55	33
56	64
57	87
58	68
59	59
60	60
61	89
62	48
63	91
64	74
65	67
66	70