A078441 - cp's OEIS frontend

A078441 a(n) begins the first chain of n consecutive positive integers that have equal h-values, where h(k) is the length of the finite sequence k, f(k), f(f(k)), ...., 1 in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)

n	a(n)
1	1
2	12
3	28
4	98
5	98
6	386
7	943
8	1494
9	1680
10	2987
11	2987
12	2987
13	2987
14	2987
15	7083
16	7083
17	7083
18	57346
19	57346
20	57346
21	57346
22	57346
23	57346
24	57346
25	57346
26	252548
27	252548
28	331778
29	331778
30	524289
31	596310
32	596310
33	596310
34	596310
35	596310
36	596310
37	596310
38	596310
39	596310
40	596310
41	2886352
42	3247146
43	3247146
44	3247146
45	3247146
46	3247146
47	3247146
48	3264428
49	3264428
50	3264428
51	3264428
52	3264428
53	4585418
54	4585418

[1, 12, 28, 98, 98, 386, 943, 1494, 1680, 2987, 2987, 2987, 2987, 2987, 7083, 7083, 7083, 57346, 57346, 57346, 57346, 57346, 57346, 57346, 57346, 252548, 252548, 331778, 331778, 524289, 596310, 596310, 596310, 596310, 596310, 596310, 596310, 596310, 596310, 596310, 2886352, 3247146, 3247146, 3247146, 3247146, 3247146, 3247146, 3264428, 3264428, 3264428, 3264428, 3264428, 4585418, 4585418]

cp's OEIS Frontend

A078441 a(n) begins the first chain of n consecutive positive integers that have equal h-values, where h(k) is the length of the finite sequence k, f(k), f(f(k)), ...., 1 in the Collatz (or 3x + 1) problem. (The earliest "1" is meant.)

Table of values

List of values