A330073 - cp's OEIS frontend

A330073 Irregular triangle read as rows in which row n is the result of iterating the operation f(n) = n/5 if n == 0 (mod 5), otherwise f(n) = 5*(floor(n/5) + n + 1), terminating at the first occurrence of 1.

n	a(n)
1	1
2	2
3	15
4	3
5	20
6	4
7	25
8	5
9	1
10	3
11	20
12	4
13	25
14	5
15	1
16	4
17	25
18	5
19	1
20	5
21	1
22	6
23	40
24	8
25	50
26	10
27	2
28	15
29	3
30	20
31	4
32	25
33	5
34	1
35	7
36	45
37	9
38	55
39	11
40	70
41	14
42	85
43	17
44	105
45	21
46	130
47	26
48	160
49	32
50	195
51	39
52	235
53	47
54	285
55	57
56	345
57	69
58	415
59	83
60	500
61	100
62	20
63	4
64	25
65	5
66	1
67	8
68	50

[1, 2, 15, 3, 20, 4, 25, 5, 1, 3, 20, 4, 25, 5, 1, 4, 25, 5, 1, 5, 1, 6, 40, 8, 50, 10, 2, 15, 3, 20, 4, 25, 5, 1, 7, 45, 9, 55, 11, 70, 14, 85, 17, 105, 21, 130, 26, 160, 32, 195, 39, 235, 47, 285, 57, 345, 69, 415, 83, 500, 100, 20, 4, 25, 5, 1, 8, 50]

cp's OEIS Frontend

A330073 Irregular triangle read as rows in which row n is the result of iterating the operation f(n) = n/5 if n == 0 (mod 5), otherwise f(n) = 5*(floor(n/5) + n + 1), terminating at the first occurrence of 1.

Table of values

List of values

n	a(n)
1	1
2	2
3	15
4	3
5	20
6	4
7	25
8	5
9	1
10	3
11	20
12	4
13	25
14	5
15	1
16	4
17	25
18	5
19	1
20	5
21	1
22	6
23	40
24	8
25	50
26	10
27	2
28	15
29	3
30	20
31	4
32	25
33	5
34	1
35	7
36	45
37	9
38	55
39	11
40	70
41	14
42	85
43	17
44	105
45	21
46	130
47	26
48	160
49	32
50	195
51	39
52	235
53	47
54	285
55	57
56	345
57	69
58	415
59	83
60	500
61	100
62	20
63	4
64	25
65	5
66	1
67	8
68	50

n	a(n)
1	1
2	2
3	15
4	3
5	20
6	4
7	25
8	5
9	1
10	3
11	20
12	4
13	25
14	5
15	1
16	4
17	25
18	5
19	1
20	5
21	1
22	6
23	40
24	8
25	50
26	10
27	2
28	15
29	3
30	20
31	4
32	25
33	5
34	1
35	7
36	45
37	9
38	55
39	11
40	70
41	14
42	85
43	17
44	105
45	21
46	130
47	26
48	160
49	32
50	195
51	39
52	235
53	47
54	285
55	57
56	345
57	69
58	415
59	83
60	500
61	100
62	20
63	4
64	25
65	5
66	1
67	8
68	50

n	a(n)
1	1
2	2
3	15
4	3
5	20
6	4
7	25
8	5
9	1
10	3
11	20
12	4
13	25
14	5
15	1
16	4
17	25
18	5
19	1
20	5
21	1
22	6
23	40
24	8
25	50
26	10
27	2
28	15
29	3
30	20
31	4
32	25
33	5
34	1
35	7
36	45
37	9
38	55
39	11
40	70
41	14
42	85
43	17
44	105
45	21
46	130
47	26
48	160
49	32
50	195
51	39
52	235
53	47
54	285
55	57
56	345
57	69
58	415
59	83
60	500
61	100
62	20
63	4
64	25
65	5
66	1
67	8
68	50