A330807 - cp's OEIS frontend

A330807 a(1) = 2; a(n+1) = Sum_{k=1..n} {S(a(k)): S(a(k)) = S(a(n))}, where S is sopfr (A001414).

n	a(n)
1	2
2	2
3	4
4	4
5	8
6	6
7	5
8	10
9	7
10	14
11	9
12	12
13	21
14	10
15	28
16	11
17	22
18	13
19	26
20	15
21	8
22	18
23	16
24	24
25	18
26	32
27	20
28	27
29	36
30	30
31	40
32	33
33	14
34	45
35	44
36	30
37	50
38	12
39	35
40	24
41	54
42	55
43	16
44	40
45	66
46	32
47	60
48	36
49	70
50	28
51	77
52	18
53	48
54	88
55	17
56	34
57	19
58	38
59	21
60	80
61	39
62	48
63	99
64	51
65	20
66	63
67	52
68	68
69	42
70	48
71	110
72	36
73	90
74	65
75	54
76	121
77	22
78	78
79	72
80	60
81	72
82	84
83	42
84	96

[2, 2, 4, 4, 8, 6, 5, 10, 7, 14, 9, 12, 21, 10, 28, 11, 22, 13, 26, 15, 8, 18, 16, 24, 18, 32, 20, 27, 36, 30, 40, 33, 14, 45, 44, 30, 50, 12, 35, 24, 54, 55, 16, 40, 66, 32, 60, 36, 70, 28, 77, 18, 48, 88, 17, 34, 19, 38, 21, 80, 39, 48, 99, 51, 20, 63, 52, 68, 42, 48, 110, 36, 90, 65, 54, 121, 22, 78, 72, 60, 72, 84, 42, 96]

cp's OEIS Frontend

A330807 a(1) = 2; a(n+1) = Sum_{k=1..n} {S(a(k)): S(a(k)) = S(a(n))}, where S is sopfr (A001414).

Table of values

List of values

n	a(n)
1	2
2	2
3	4
4	4
5	8
6	6
7	5
8	10
9	7
10	14
11	9
12	12
13	21
14	10
15	28
16	11
17	22
18	13
19	26
20	15
21	8
22	18
23	16
24	24
25	18
26	32
27	20
28	27
29	36
30	30
31	40
32	33
33	14
34	45
35	44
36	30
37	50
38	12
39	35
40	24
41	54
42	55
43	16
44	40
45	66
46	32
47	60
48	36
49	70
50	28
51	77
52	18
53	48
54	88
55	17
56	34
57	19
58	38
59	21
60	80
61	39
62	48
63	99
64	51
65	20
66	63
67	52
68	68
69	42
70	48
71	110
72	36
73	90
74	65
75	54
76	121
77	22
78	78
79	72
80	60
81	72
82	84
83	42
84	96

n	a(n)
1	2
2	2
3	4
4	4
5	8
6	6
7	5
8	10
9	7
10	14
11	9
12	12
13	21
14	10
15	28
16	11
17	22
18	13
19	26
20	15
21	8
22	18
23	16
24	24
25	18
26	32
27	20
28	27
29	36
30	30
31	40
32	33
33	14
34	45
35	44
36	30
37	50
38	12
39	35
40	24
41	54
42	55
43	16
44	40
45	66
46	32
47	60
48	36
49	70
50	28
51	77
52	18
53	48
54	88
55	17
56	34
57	19
58	38
59	21
60	80
61	39
62	48
63	99
64	51
65	20
66	63
67	52
68	68
69	42
70	48
71	110
72	36
73	90
74	65
75	54
76	121
77	22
78	78
79	72
80	60
81	72
82	84
83	42
84	96

n	a(n)
1	2
2	2
3	4
4	4
5	8
6	6
7	5
8	10
9	7
10	14
11	9
12	12
13	21
14	10
15	28
16	11
17	22
18	13
19	26
20	15
21	8
22	18
23	16
24	24
25	18
26	32
27	20
28	27
29	36
30	30
31	40
32	33
33	14
34	45
35	44
36	30
37	50
38	12
39	35
40	24
41	54
42	55
43	16
44	40
45	66
46	32
47	60
48	36
49	70
50	28
51	77
52	18
53	48
54	88
55	17
56	34
57	19
58	38
59	21
60	80
61	39
62	48
63	99
64	51
65	20
66	63
67	52
68	68
69	42
70	48
71	110
72	36
73	90
74	65
75	54
76	121
77	22
78	78
79	72
80	60
81	72
82	84
83	42
84	96