A271973 - cp's OEIS frontend

A271973 Smallest number k such that gcd(s1, s2) = n, where s1 is the sum of the odd numbers and s2 is the sum of the even numbers in the Collatz (3x+1) trajectory of k.

n	a(n)
1	1
2	10
3	9
4	30
5	65
6	5
7	74
8	86
9	368
10	135
11	970
12	50
13	95
14	101
15	1045
16	178
17	793
18	7
19	214
20	196
21	18
22	423
23	133
24	200
25	2572
26	629
27	621
28	358
29	700
30	451
31	3167
32	1924
33	3611
34	1926
35	662
36	510
37	6688
38	437
39	1525
40	5072
41	3724
42	3161
43	1034
44	240
45	5848
46	2487
47	704
48	442
49	19120
50	1230
51	5138
52	3524

[1, 10, 9, 30, 65, 5, 74, 86, 368, 135, 970, 50, 95, 101, 1045, 178, 793, 7, 214, 196, 18, 423, 133, 200, 2572, 629, 621, 358, 700, 451, 3167, 1924, 3611, 1926, 662, 510, 6688, 437, 1525, 5072, 3724, 3161, 1034, 240, 5848, 2487, 704, 442, 19120, 1230, 5138, 3524]

cp's OEIS Frontend

A271973 Smallest number k such that gcd(s1, s2) = n, where s1 is the sum of the odd numbers and s2 is the sum of the even numbers in the Collatz (3x+1) trajectory of k.

Table of values

List of values