A355647 - cp's OEIS frontend

A355647 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest positive number that has not yet appeared that has the same number of divisors as the sum a(n-2) + a(n-1).

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	11
8	12
9	13
10	4
11	17
12	8
13	9
14	19
15	18
16	23
17	29
18	20
19	25
20	28
21	31
22	37
23	32
24	10
25	24
26	14
27	15
28	41
29	30
30	43
31	47
32	60
33	53
34	59
35	48
36	61
37	67
38	40
39	71
40	21
41	44
42	22
43	42
44	64
45	26
46	72
47	45
48	50
49	27
50	33
51	84
52	52
53	54
54	34
55	56
56	90
57	35
58	38
59	73
60	39
61	80
62	46
63	96
64	51
65	63
66	66
67	55
68	49
69	70
70	57
71	79
72	78
73	83
74	58
75	62
76	120

[1, 2, 3, 5, 6, 7, 11, 12, 13, 4, 17, 8, 9, 19, 18, 23, 29, 20, 25, 28, 31, 37, 32, 10, 24, 14, 15, 41, 30, 43, 47, 60, 53, 59, 48, 61, 67, 40, 71, 21, 44, 22, 42, 64, 26, 72, 45, 50, 27, 33, 84, 52, 54, 34, 56, 90, 35, 38, 73, 39, 80, 46, 96, 51, 63, 66, 55, 49, 70, 57, 79, 78, 83, 58, 62, 120]

cp's OEIS Frontend

A355647 a(1) = 1, a(2) = 2; for n > 2, a(n) is the smallest positive number that has not yet appeared that has the same number of divisors as the sum a(n-2) + a(n-1).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	11
8	12
9	13
10	4
11	17
12	8
13	9
14	19
15	18
16	23
17	29
18	20
19	25
20	28
21	31
22	37
23	32
24	10
25	24
26	14
27	15
28	41
29	30
30	43
31	47
32	60
33	53
34	59
35	48
36	61
37	67
38	40
39	71
40	21
41	44
42	22
43	42
44	64
45	26
46	72
47	45
48	50
49	27
50	33
51	84
52	52
53	54
54	34
55	56
56	90
57	35
58	38
59	73
60	39
61	80
62	46
63	96
64	51
65	63
66	66
67	55
68	49
69	70
70	57
71	79
72	78
73	83
74	58
75	62
76	120

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	11
8	12
9	13
10	4
11	17
12	8
13	9
14	19
15	18
16	23
17	29
18	20
19	25
20	28
21	31
22	37
23	32
24	10
25	24
26	14
27	15
28	41
29	30
30	43
31	47
32	60
33	53
34	59
35	48
36	61
37	67
38	40
39	71
40	21
41	44
42	22
43	42
44	64
45	26
46	72
47	45
48	50
49	27
50	33
51	84
52	52
53	54
54	34
55	56
56	90
57	35
58	38
59	73
60	39
61	80
62	46
63	96
64	51
65	63
66	66
67	55
68	49
69	70
70	57
71	79
72	78
73	83
74	58
75	62
76	120

n	a(n)
1	1
2	2
3	3
4	5
5	6
6	7
7	11
8	12
9	13
10	4
11	17
12	8
13	9
14	19
15	18
16	23
17	29
18	20
19	25
20	28
21	31
22	37
23	32
24	10
25	24
26	14
27	15
28	41
29	30
30	43
31	47
32	60
33	53
34	59
35	48
36	61
37	67
38	40
39	71
40	21
41	44
42	22
43	42
44	64
45	26
46	72
47	45
48	50
49	27
50	33
51	84
52	52
53	54
54	34
55	56
56	90
57	35
58	38
59	73
60	39
61	80
62	46
63	96
64	51
65	63
66	66
67	55
68	49
69	70
70	57
71	79
72	78
73	83
74	58
75	62
76	120