A300289 - cp's OEIS frontend

A300289 a(n) is the smallest prime p such that the product of p and prime(n) contains only prime digits, or -1 if no such prime p exists.

n	a(n)
1	11
2	11
3	5
4	5
5	2
6	29
7	19
8	3
9	11
10	13
11	17
12	61
13	13
14	59
15	5
16	61
17	43
18	37
19	5
20	5
21	101
22	3
23	31
24	307
25	59
26	23
27	541
28	5
29	3
30	29
31	179
32	17
33	1721
34	257
35	17
36	5
37	239
38	229
39	199
40	149
41	3
42	13
43	3
44	1439
45	281
46	127
47	107
48	101
49	9791
50	163
51	31
52	107
53	3
54	3
55	139
56	199
57	83
58	13
59	929
60	83
61	19
62	11
63	11
64	107
65	71
66	181
67	167
68	661
69	1031

[11, 11, 5, 5, 2, 29, 19, 3, 11, 13, 17, 61, 13, 59, 5, 61, 43, 37, 5, 5, 101, 3, 31, 307, 59, 23, 541, 5, 3, 29, 179, 17, 1721, 257, 17, 5, 239, 229, 199, 149, 3, 13, 3, 1439, 281, 127, 107, 101, 9791, 163, 31, 107, 3, 3, 139, 199, 83, 13, 929, 83, 19, 11, 11, 107, 71, 181, 167, 661, 1031]

cp's OEIS Frontend

A300289 a(n) is the smallest prime p such that the product of p and prime(n) contains only prime digits, or -1 if no such prime p exists.

Table of values

List of values