A304715 - cp's OEIS frontend

A304715 For any n > 0, if A006666(n) >= 0, then a(n) = Sum_{i = 0..A006666(n)-1} 2^i * [T^i(n) == 0 (mod 2)] (where [] is an Iverson bracket and T^i denotes the i-th iterate of the Collatz function A014682); otherwise a(n) = -1.

n	a(n)
1	0
2	1
3	28
4	3
5	14
6	57
7	1896
8	7
9	7586
10	29
11	948
12	115
13	118
14	3793
15	3824
16	15
17	474
18	15173
19	15180
20	59
21	62
22	1897
23	1912
24	231
25	60722
26	237
27	1102691417057682138372
28	7587
29	7590
30	7649
31	137836427132210267296
32	31
33	242890
34	949
35	956
36	30347
37	30350
38	30361
39	7772616
40	119

[0, 1, 28, 3, 14, 57, 1896, 7, 7586, 29, 948, 115, 118, 3793, 3824, 15, 474, 15173, 15180, 59, 62, 1897, 1912, 231, 60722, 237, 1102691417057682138372, 7587, 7590, 7649, 137836427132210267296, 31, 242890, 949, 956, 30347, 30350, 30361, 7772616, 119]

cp's OEIS Frontend

A304715 For any n > 0, if A006666(n) >= 0, then a(n) = Sum_{i = 0..A006666(n)-1} 2^i * [T^i(n) == 0 (mod 2)] (where [] is an Iverson bracket and T^i denotes the i-th iterate of the Collatz function A014682); otherwise a(n) = -1.

Table of values

List of values