A059175 - cp's OEIS frontend

A059175 For a rational number p/q let f(p/q) = p*q divided by the sum of digits of p and q; 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)
0	0
1	66
2	66
3	462
4	180
5	66
6	31395
7	714
8	72
9	9
10	5
11	15
12	3
13	36
14	42
15	39
16	2
17	9
18	45
19	462
20	12
21	12
22	90
23	3703207920
24	1692600
25	84
26	234
27	27
28	3043425
29	74613
30	6
31	7930296
32	264
33	4290
34	510
35	315
36	315
37	73302369360
38	1155
39	3
40	8
41	239872017
42	6
43	4386
44	1989
45	18
46	17740866
47	499954980

[0, 66, 66, 462, 180, 66, 31395, 714, 72, 9, 5, 15, 3, 36, 42, 39, 2, 9, 45, 462, 12, 12, 90, 3703207920, 1692600, 84, 234, 27, 3043425, 74613, 6, 7930296, 264, 4290, 510, 315, 315, 73302369360, 1155, 3, 8, 239872017, 6, 4386, 1989, 18, 17740866, 499954980]

cp's OEIS Frontend

A059175 For a rational number p/q let f(p/q) = p*q divided by the sum of digits of p and q; 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