A329181 - cp's OEIS frontend

A329181 a(n) = n if n is 1 or prime; otherwise (1) let m = (concatenation of the two divisors in the middle of rows of A027750(n)), (2) if m is prime then a(n) = m, otherwise return to (1) with n=m.

n	a(n)
1	1
2	2
3	3
4	211
5	5
6	23
7	7
8	223
9	311
10	773
11	11
12	21179
13	13
14	313
15	1129
16	3137
17	17
18	3449
19	19
20	59
21	37
22	211
23	23
24	223
25	773
26	3251
27	313
28	47
29	29
30	613
31	31
32	4373
33	311
34	21179
35	1129
36	3449
37	37
38	373
39	313
40	229
41	41
42	67
43	43
44	3137
45	59
46	223
47	47
48	4373
49	131321
50	33391
51	317
52	2333
53	53

[1, 2, 3, 211, 5, 23, 7, 223, 311, 773, 11, 21179, 13, 313, 1129, 3137, 17, 3449, 19, 59, 37, 211, 23, 223, 773, 3251, 313, 47, 29, 613, 31, 4373, 311, 21179, 1129, 3449, 37, 373, 313, 229, 41, 67, 43, 3137, 59, 223, 47, 4373, 131321, 33391, 317, 2333, 53]

cp's OEIS Frontend

A329181 a(n) = n if n is 1 or prime; otherwise (1) let m = (concatenation of the two divisors in the middle of rows of A027750(n)), (2) if m is prime then a(n) = m, otherwise return to (1) with n=m.

Table of values

List of values