A261085 - cp's OEIS frontend

A261085 Number of steps needed to reach zero when starting from the n-th prime [i.e., setting k to A000040(n)] and repeatedly applying the map that replaces k with k - d(k), where d(k) is the number of divisors of k (A000005).

n	a(n)
1	1
2	2
3	3
4	4
5	4
6	5
7	6
8	7
9	8
10	10
11	11
12	13
13	14
14	15
15	15
16	17
17	19
18	20
19	22
20	23
21	24
22	26
23	16
24	18
25	20
26	21
27	22
28	22
29	23
30	24
31	23
32	24
33	25
34	26
35	28
36	29
37	31
38	33
39	33
40	34
41	36
42	37
43	39
44	40
45	40
46	41
47	44
48	47
49	34
50	35
51	49
52	51
53	52
54	54
55	54
56	55
57	57
58	58
59	59
60	58
61	59
62	62
63	48
64	49
65	50
66	66
67	69
68	71
69	73
70	74
71	74
72	76
73	55
74	57
75	59
76	60
77	61
78	63
79	63
80	65
81	68
82	69
83	71
84	72
85	74
86	62
87	64
88	65
89	66
90	67
91	67
92	70
93	72
94	73
95	75
96	76
97	77
98	80
99	81
100	75
101	77
102	79
103	79
104	81

[1, 2, 3, 4, 4, 5, 6, 7, 8, 10, 11, 13, 14, 15, 15, 17, 19, 20, 22, 23, 24, 26, 16, 18, 20, 21, 22, 22, 23, 24, 23, 24, 25, 26, 28, 29, 31, 33, 33, 34, 36, 37, 39, 40, 40, 41, 44, 47, 34, 35, 49, 51, 52, 54, 54, 55, 57, 58, 59, 58, 59, 62, 48, 49, 50, 66, 69, 71, 73, 74, 74, 76, 55, 57, 59, 60, 61, 63, 63, 65, 68, 69, 71, 72, 74, 62, 64, 65, 66, 67, 67, 70, 72, 73, 75, 76, 77, 80, 81, 75, 77, 79, 79, 81]

cp's OEIS Frontend

A261085 Number of steps needed to reach zero when starting from the n-th prime [i.e., setting k to A000040(n)] and repeatedly applying the map that replaces k with k - d(k), where d(k) is the number of divisors of k (A000005).

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	4
5	4
6	5
7	6
8	7
9	8
10	10
11	11
12	13
13	14
14	15
15	15
16	17
17	19
18	20
19	22
20	23
21	24
22	26
23	16
24	18
25	20
26	21
27	22
28	22
29	23
30	24
31	23
32	24
33	25
34	26
35	28
36	29
37	31
38	33
39	33
40	34
41	36
42	37
43	39
44	40
45	40
46	41
47	44
48	47
49	34
50	35
51	49
52	51
53	52
54	54
55	54
56	55
57	57
58	58
59	59
60	58
61	59
62	62
63	48
64	49
65	50
66	66
67	69
68	71
69	73
70	74
71	74
72	76
73	55
74	57
75	59
76	60
77	61
78	63
79	63
80	65
81	68
82	69
83	71
84	72
85	74
86	62
87	64
88	65
89	66
90	67
91	67
92	70
93	72
94	73
95	75
96	76
97	77
98	80
99	81
100	75
101	77
102	79
103	79
104	81

n	a(n)
1	1
2	2
3	3
4	4
5	4
6	5
7	6
8	7
9	8
10	10
11	11
12	13
13	14
14	15
15	15
16	17
17	19
18	20
19	22
20	23
21	24
22	26
23	16
24	18
25	20
26	21
27	22
28	22
29	23
30	24
31	23
32	24
33	25
34	26
35	28
36	29
37	31
38	33
39	33
40	34
41	36
42	37
43	39
44	40
45	40
46	41
47	44
48	47
49	34
50	35
51	49
52	51
53	52
54	54
55	54
56	55
57	57
58	58
59	59
60	58
61	59
62	62
63	48
64	49
65	50
66	66
67	69
68	71
69	73
70	74
71	74
72	76
73	55
74	57
75	59
76	60
77	61
78	63
79	63
80	65
81	68
82	69
83	71
84	72
85	74
86	62
87	64
88	65
89	66
90	67
91	67
92	70
93	72
94	73
95	75
96	76
97	77
98	80
99	81
100	75
101	77
102	79
103	79
104	81

n	a(n)
1	1
2	2
3	3
4	4
5	4
6	5
7	6
8	7
9	8
10	10
11	11
12	13
13	14
14	15
15	15
16	17
17	19
18	20
19	22
20	23
21	24
22	26
23	16
24	18
25	20
26	21
27	22
28	22
29	23
30	24
31	23
32	24
33	25
34	26
35	28
36	29
37	31
38	33
39	33
40	34
41	36
42	37
43	39
44	40
45	40
46	41
47	44
48	47
49	34
50	35
51	49
52	51
53	52
54	54
55	54
56	55
57	57
58	58
59	59
60	58
61	59
62	62
63	48
64	49
65	50
66	66
67	69
68	71
69	73
70	74
71	74
72	76
73	55
74	57
75	59
76	60
77	61
78	63
79	63
80	65
81	68
82	69
83	71
84	72
85	74
86	62
87	64
88	65
89	66
90	67
91	67
92	70
93	72
94	73
95	75
96	76
97	77
98	80
99	81
100	75
101	77
102	79
103	79
104	81