A104644 - cp's OEIS frontend

A104644 a(n) is the smallest prime divisor of the number obtained from concatenation of the first n primes.

n	a(n)
1	2
2	23
3	5
4	2357
5	7
6	23
7	11
8	7
9	61
10	3
11	17
12	7
13	25391
14	6899
15	1597
16	3
17	17
18	3
19	1019
20	3
21	17
22	211
23	41378209
24	3
25	479
26	3
27	262343078386137703
28	3
29	107
30	3
31	643
32	3
33	7
34	3
35	13
36	3
37	107069
38	7
39	14733071537
40	3
41	61911427
42	3
43	13
44	3
45	31
46	3
47	11
48	59
49	7
50	647
51	31
52	3
53	13
54	3
55	31517
56	43
57	3
58	19

[2, 23, 5, 2357, 7, 23, 11, 7, 61, 3, 17, 7, 25391, 6899, 1597, 3, 17, 3, 1019, 3, 17, 211, 41378209, 3, 479, 3, 262343078386137703, 3, 107, 3, 643, 3, 7, 3, 13, 3, 107069, 7, 14733071537, 3, 61911427, 3, 13, 3, 31, 3, 11, 59, 7, 647, 31, 3, 13, 3, 31517, 43, 3, 19]

cp's OEIS Frontend

A104644 a(n) is the smallest prime divisor of the number obtained from concatenation of the first n primes.

Table of values

List of values