A181921 - cp's OEIS frontend

A181921 The smallest positive integer that produces exactly n primes in a Collatz trajectory.

n	a(n)
1	2
2	5
3	3
4	15
5	11
6	7
7	19
8	43
9	67
10	89
11	39
12	127
13	123
14	223
15	111
16	351
17	175
18	155
19	103
20	63
21	107
22	71
23	47
24	31
25	27
26	97
27	193
28	171
29	231
30	487
31	1087
32	763
33	2223
34	2143
35	1263
36	1071
37	4011
38	6919
39	8127
40	13183
41	6591
42	6943
43	6171
44	10971
45	46443
46	48927
47	35295
48	17647
49	70589
50	47059

[2, 5, 3, 15, 11, 7, 19, 43, 67, 89, 39, 127, 123, 223, 111, 351, 175, 155, 103, 63, 107, 71, 47, 31, 27, 97, 193, 171, 231, 487, 1087, 763, 2223, 2143, 1263, 1071, 4011, 6919, 8127, 13183, 6591, 6943, 6171, 10971, 46443, 48927, 35295, 17647, 70589, 47059]

cp's OEIS Frontend

A181921 The smallest positive integer that produces exactly n primes in a Collatz trajectory.

Table of values

List of values