A074923 - cp's OEIS frontend

A074923 Number of steps to reach the first integer starting with prime(n+1)/prime(n) and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached.

n	a(n)
1	1
2	6
3	18
4	5
5	5
6	7
7	37
8	132
9	29
10	63
11	46
12	11
13	7
14	212
15	25
16	38
17	145
18	136
19	46
20	118
21	39
22	37
23	24
24	15
25	19
26	85
27	211
28	179
29	249
30	266
31	190
32	87
33	259
34	216
35	16
36	70
37	210
38	56
39	255
40	94
41	143
42	244
43	482
44	558
45	46
46	327
47	271
48	93
49	110
50	8
51	121
52	29
53	421
54	329
55	47
56	40
57	394
58	376
59	64
60	249
61	49
62	390
63	321

[1, 6, 18, 5, 5, 7, 37, 132, 29, 63, 46, 11, 7, 212, 25, 38, 145, 136, 46, 118, 39, 37, 24, 15, 19, 85, 211, 179, 249, 266, 190, 87, 259, 216, 16, 70, 210, 56, 255, 94, 143, 244, 482, 558, 46, 327, 271, 93, 110, 8, 121, 29, 421, 329, 47, 40, 394, 376, 64, 249, 49, 390, 321]

cp's OEIS Frontend

A074923 Number of steps to reach the first integer starting with prime(n+1)/prime(n) and iterating the map x -> x*ceiling(x), or -1 if no integer is ever reached.

Table of values

List of values

n	a(n)
1	1
2	6
3	18
4	5
5	5
6	7
7	37
8	132
9	29
10	63
11	46
12	11
13	7
14	212
15	25
16	38
17	145
18	136
19	46
20	118
21	39
22	37
23	24
24	15
25	19
26	85
27	211
28	179
29	249
30	266
31	190
32	87
33	259
34	216
35	16
36	70
37	210
38	56
39	255
40	94
41	143
42	244
43	482
44	558
45	46
46	327
47	271
48	93
49	110
50	8
51	121
52	29
53	421
54	329
55	47
56	40
57	394
58	376
59	64
60	249
61	49
62	390
63	321

n	a(n)
1	1
2	6
3	18
4	5
5	5
6	7
7	37
8	132
9	29
10	63
11	46
12	11
13	7
14	212
15	25
16	38
17	145
18	136
19	46
20	118
21	39
22	37
23	24
24	15
25	19
26	85
27	211
28	179
29	249
30	266
31	190
32	87
33	259
34	216
35	16
36	70
37	210
38	56
39	255
40	94
41	143
42	244
43	482
44	558
45	46
46	327
47	271
48	93
49	110
50	8
51	121
52	29
53	421
54	329
55	47
56	40
57	394
58	376
59	64
60	249
61	49
62	390
63	321

n	a(n)
1	1
2	6
3	18
4	5
5	5
6	7
7	37
8	132
9	29
10	63
11	46
12	11
13	7
14	212
15	25
16	38
17	145
18	136
19	46
20	118
21	39
22	37
23	24
24	15
25	19
26	85
27	211
28	179
29	249
30	266
31	190
32	87
33	259
34	216
35	16
36	70
37	210
38	56
39	255
40	94
41	143
42	244
43	482
44	558
45	46
46	327
47	271
48	93
49	110
50	8
51	121
52	29
53	421
54	329
55	47
56	40
57	394
58	376
59	64
60	249
61	49
62	390
63	321