A037274 - cp's OEIS frontend

A037274 Home primes: for n >= 2, a(n) = the prime that is finally reached when you start with n, concatenate its prime factors (A037276) and repeat until a prime is reached (a(n) = -1 if no prime is ever reached).

n	a(n)
1	1
2	2
3	3
4	211
5	5
6	23
7	7
8	3331113965338635107
9	311
10	773
11	11
12	223
13	13
14	13367
15	1129
16	31636373
17	17
18	233
19	19
20	3318308475676071413
21	37
22	211
23	23
24	331319
25	773
26	3251
27	13367
28	227
29	29
30	547
31	31
32	241271
33	311
34	31397
35	1129
36	71129
37	37
38	373
39	313
40	3314192745739
41	41
42	379
43	43
44	22815088913
45	3411949
46	223
47	47
48	6161791591356884791277

[1, 2, 3, 211, 5, 23, 7, 3331113965338635107, 311, 773, 11, 223, 13, 13367, 1129, 31636373, 17, 233, 19, 3318308475676071413, 37, 211, 23, 331319, 773, 3251, 13367, 227, 29, 547, 31, 241271, 311, 31397, 1129, 71129, 37, 373, 313, 3314192745739, 41, 379, 43, 22815088913, 3411949, 223, 47, 6161791591356884791277]

cp's OEIS Frontend

A037274 Home primes: for n >= 2, a(n) = the prime that is finally reached when you start with n, concatenate its prime factors (A037276) and repeat until a prime is reached (a(n) = -1 if no prime is ever reached).

Table of values

List of values