A208127 - cp's OEIS frontend

A208127 Cardinality of the set f^n({s}), where f is a variant of the Collatz function that replaces any element x in the argument set with both x/2 and 3*x+1, and s is an arbitrary irrational number.

n	a(n)
0	1
1	2
2	4
3	8
4	16
5	32
6	64
7	127
8	252
9	495
10	969
11	1886
12	3655
13	7054
14	13562
15	25978
16	49602
17	94440
18	179380
19	340001
20	643276
21	1215178
22	2292431
23	4319603
24	8131123
25	15292302
26	28738320
27	53970713
28	101297742
29	190028125
30	356319648
31	667866054
32	1251374689
33	2343968788
34	4389333758
35	8217535290
36	15381296139
37	28784811039
38	53859503664

[1, 2, 4, 8, 16, 32, 64, 127, 252, 495, 969, 1886, 3655, 7054, 13562, 25978, 49602, 94440, 179380, 340001, 643276, 1215178, 2292431, 4319603, 8131123, 15292302, 28738320, 53970713, 101297742, 190028125, 356319648, 667866054, 1251374689, 2343968788, 4389333758, 8217535290, 15381296139, 28784811039, 53859503664]

cp's OEIS Frontend

A208127 Cardinality of the set f^n({s}), where f is a variant of the Collatz function that replaces any element x in the argument set with both x/2 and 3*x+1, and s is an arbitrary irrational number.

Table of values

List of values