A059514 - cp's OEIS frontend

A059514 For a rational number p/q let f(p/q) = p*q divided by (the sum of digits of p and of q) minus 1; a(n) is obtained by iterating f, starting at n/1, until an integer is reached, or if no integer is ever reached then a(n) = 0.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	10
11	11
12	4
13	28
14	42
15	7315
16	208
17	136
18	2
19	19
20	10
21	7
22	11
23	69
24	4
25	2310
26	28
27	3
28	42
29	319
30	10
31	189885850
32	96
33	11
34	323323
35	205530
36	4
37	37
38	228
39	28
40	10
41	123
42	7
43	559
44	11
45	5
46	69
47	517
48	4
49	152152
50	10
51	187
52	28
53	424
54	6
55	11
56	154
57	0
58	77140
59	2478
60	10
61	0

[1, 1, 1, 1, 1, 1, 1, 1, 1, 10, 11, 4, 28, 42, 7315, 208, 136, 2, 19, 10, 7, 11, 69, 4, 2310, 28, 3, 42, 319, 10, 189885850, 96, 11, 323323, 205530, 4, 37, 228, 28, 10, 123, 7, 559, 11, 5, 69, 517, 4, 152152, 10, 187, 28, 424, 6, 11, 154, 0, 77140, 2478, 10, 0]

cp's OEIS Frontend

A059514 For a rational number p/q let f(p/q) = p*q divided by (the sum of digits of p and of q) minus 1; a(n) is obtained by iterating f, starting at n/1, until an integer is reached, or if no integer is ever reached then a(n) = 0.

Table of values

List of values