A277564 - cp's OEIS frontend

A277564 Let {c(i)} = A007916 denote the sequence of numbers > 1 which are not perfect powers. Every positive integer n has a unique representation as a tower n = c(x_1)^c(x_2)^c(x_3)^...^c(x_k), where the exponents are nested from the right. The sequence is an irregular triangle read by rows, where the n-th row lists n followed by x_1, ..., x_k.

n	a(n)
1	1
2	2
3	1
4	3
5	2
6	4
7	1
8	1
9	5
10	3
11	6
12	4
13	7
14	5
15	8
16	1
17	2
18	9
19	2
20	1
21	10
22	6
23	11
24	7
25	12
26	8
27	13
28	9
29	14
30	10
31	15
32	11
33	16
34	1
35	1
36	1
37	17
38	12
39	18
40	13
41	19
42	14
43	20
44	15
45	21
46	16
47	22
48	17
49	23
50	18
51	24
52	19
53	25
54	3
55	1
56	26
57	20
58	27
59	2
60	2
61	28
62	21
63	29
64	22
65	30
66	23
67	31
68	24
69	32
70	1
71	3
72	33
73	25
74	34
75	26
76	35
77	27
78	36
79	4
80	1
81	37
82	28
83	38
84	29
85	39
86	30
87	40
88	31

[1, 2, 1, 3, 2, 4, 1, 1, 5, 3, 6, 4, 7, 5, 8, 1, 2, 9, 2, 1, 10, 6, 11, 7, 12, 8, 13, 9, 14, 10, 15, 11, 16, 1, 1, 1, 17, 12, 18, 13, 19, 14, 20, 15, 21, 16, 22, 17, 23, 18, 24, 19, 25, 3, 1, 26, 20, 27, 2, 2, 28, 21, 29, 22, 30, 23, 31, 24, 32, 1, 3, 33, 25, 34, 26, 35, 27, 36, 4, 1, 37, 28, 38, 29, 39, 30, 40, 31]

cp's OEIS Frontend

Table of values

List of values

n	a(n)
1	1
2	2
3	1
4	3
5	2
6	4
7	1
8	1
9	5
10	3
11	6
12	4
13	7
14	5
15	8
16	1
17	2
18	9
19	2
20	1
21	10
22	6
23	11
24	7
25	12
26	8
27	13
28	9
29	14
30	10
31	15
32	11
33	16
34	1
35	1
36	1
37	17
38	12
39	18
40	13
41	19
42	14
43	20
44	15
45	21
46	16
47	22
48	17
49	23
50	18
51	24
52	19
53	25
54	3
55	1
56	26
57	20
58	27
59	2
60	2
61	28
62	21
63	29
64	22
65	30
66	23
67	31
68	24
69	32
70	1
71	3
72	33
73	25
74	34
75	26
76	35
77	27
78	36
79	4
80	1
81	37
82	28
83	38
84	29
85	39
86	30
87	40
88	31

n	a(n)
1	1
2	2
3	1
4	3
5	2
6	4
7	1
8	1
9	5
10	3
11	6
12	4
13	7
14	5
15	8
16	1
17	2
18	9
19	2
20	1
21	10
22	6
23	11
24	7
25	12
26	8
27	13
28	9
29	14
30	10
31	15
32	11
33	16
34	1
35	1
36	1
37	17
38	12
39	18
40	13
41	19
42	14
43	20
44	15
45	21
46	16
47	22
48	17
49	23
50	18
51	24
52	19
53	25
54	3
55	1
56	26
57	20
58	27
59	2
60	2
61	28
62	21
63	29
64	22
65	30
66	23
67	31
68	24
69	32
70	1
71	3
72	33
73	25
74	34
75	26
76	35
77	27
78	36
79	4
80	1
81	37
82	28
83	38
84	29
85	39
86	30
87	40
88	31

n	a(n)
1	1
2	2
3	1
4	3
5	2
6	4
7	1
8	1
9	5
10	3
11	6
12	4
13	7
14	5
15	8
16	1
17	2
18	9
19	2
20	1
21	10
22	6
23	11
24	7
25	12
26	8
27	13
28	9
29	14
30	10
31	15
32	11
33	16
34	1
35	1
36	1
37	17
38	12
39	18
40	13
41	19
42	14
43	20
44	15
45	21
46	16
47	22
48	17
49	23
50	18
51	24
52	19
53	25
54	3
55	1
56	26
57	20
58	27
59	2
60	2
61	28
62	21
63	29
64	22
65	30
66	23
67	31
68	24
69	32
70	1
71	3
72	33
73	25
74	34
75	26
76	35
77	27
78	36
79	4
80	1
81	37
82	28
83	38
84	29
85	39
86	30
87	40
88	31