A381902 - cp's OEIS frontend

A381902 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number such that a(n) shares a factor with 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	4
4	6
5	8
6	10
7	5
8	15
9	3
10	12
11	16
12	20
13	14
14	26
15	13
16	39
17	9
18	30
19	25
20	35
21	7
22	28
23	32
24	34
25	17
26	51
27	18
28	40
29	22
30	50
31	24
32	38
33	52
34	44
35	55
36	60
37	58
38	29
39	87
40	21
41	70
42	64
43	68
44	46
45	74
46	37
47	111
48	33
49	75
50	45
51	65
52	78
53	36
54	80
55	48
56	82
57	41
58	123
59	42
60	91
61	104
62	56
63	100
64	62
65	31

[1, 2, 4, 6, 8, 10, 5, 15, 3, 12, 16, 20, 14, 26, 13, 39, 9, 30, 25, 35, 7, 28, 32, 34, 17, 51, 18, 40, 22, 50, 24, 38, 52, 44, 55, 60, 58, 29, 87, 21, 70, 64, 68, 46, 74, 37, 111, 33, 75, 45, 65, 78, 36, 80, 48, 82, 41, 123, 42, 91, 104, 56, 100, 62, 31]

cp's OEIS Frontend

A381902 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number such that a(n) shares a factor with 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	4
4	6
5	8
6	10
7	5
8	15
9	3
10	12
11	16
12	20
13	14
14	26
15	13
16	39
17	9
18	30
19	25
20	35
21	7
22	28
23	32
24	34
25	17
26	51
27	18
28	40
29	22
30	50
31	24
32	38
33	52
34	44
35	55
36	60
37	58
38	29
39	87
40	21
41	70
42	64
43	68
44	46
45	74
46	37
47	111
48	33
49	75
50	45
51	65
52	78
53	36
54	80
55	48
56	82
57	41
58	123
59	42
60	91
61	104
62	56
63	100
64	62
65	31

n	a(n)
1	1
2	2
3	4
4	6
5	8
6	10
7	5
8	15
9	3
10	12
11	16
12	20
13	14
14	26
15	13
16	39
17	9
18	30
19	25
20	35
21	7
22	28
23	32
24	34
25	17
26	51
27	18
28	40
29	22
30	50
31	24
32	38
33	52
34	44
35	55
36	60
37	58
38	29
39	87
40	21
41	70
42	64
43	68
44	46
45	74
46	37
47	111
48	33
49	75
50	45
51	65
52	78
53	36
54	80
55	48
56	82
57	41
58	123
59	42
60	91
61	104
62	56
63	100
64	62
65	31

cp's OEIS Frontend

A381902 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number such that a(n) shares a factor with 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

A381902 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest unused positive number such that a(n) shares a factor with 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	4
4	6
5	8
6	10
7	5
8	15
9	3
10	12
11	16
12	20
13	14
14	26
15	13
16	39
17	9
18	30
19	25
20	35
21	7
22	28
23	32
24	34
25	17
26	51
27	18
28	40
29	22
30	50
31	24
32	38
33	52
34	44
35	55
36	60
37	58
38	29
39	87
40	21
41	70
42	64
43	68
44	46
45	74
46	37
47	111
48	33
49	75
50	45
51	65
52	78
53	36
54	80
55	48
56	82
57	41
58	123
59	42
60	91
61	104
62	56
63	100
64	62
65	31