A275968 - cp's OEIS frontend

A275968 Smaller of two consecutive primes p and q such that c(p) = c(q), where c(n) = A008908(n) is the length of x, f(x), f(f(x)), ... , 1 in the Collatz conjecture.

n	a(n)
1	173
2	409
3	419
4	421
5	439
6	487
7	521
8	557
9	571
10	617
11	761
12	887
13	919
14	1009
15	1039
16	1117
17	1153
18	1171
19	1217
20	1327
21	1373
22	1549
23	1559
24	1571
25	1657
26	1693
27	1709
28	1721
29	1733
30	1783
31	1831
32	1861
33	1901
34	1993
35	1997
36	2053
37	2089
38	2339
39	2393
40	2521
41	2539
42	2647
43	2657
44	2677
45	2693
46	2777

[173, 409, 419, 421, 439, 487, 521, 557, 571, 617, 761, 887, 919, 1009, 1039, 1117, 1153, 1171, 1217, 1327, 1373, 1549, 1559, 1571, 1657, 1693, 1709, 1721, 1733, 1783, 1831, 1861, 1901, 1993, 1997, 2053, 2089, 2339, 2393, 2521, 2539, 2647, 2657, 2677, 2693, 2777]

cp's OEIS Frontend

A275968 Smaller of two consecutive primes p and q such that c(p) = c(q), where c(n) = A008908(n) is the length of x, f(x), f(f(x)), ... , 1 in the Collatz conjecture.

Table of values

List of values