A213308 - cp's OEIS frontend

A213308 Numbers with exactly one nonprime substring (substrings with leading zeros are considered to be nonprime).

n	a(n)
1	1
2	4
3	6
4	8
5	9
6	13
7	17
8	22
9	25
10	27
11	29
12	31
13	32
14	33
15	35
16	43
17	47
18	52
19	55
20	57
21	59
22	67
23	71
24	72
25	75
26	77
27	79
28	83
29	97
30	137
31	173
32	223
33	233
34	237
35	313
36	317
37	337
38	353
39	379
40	523
41	537
42	673
43	733
44	737
45	773
46	797
47	1373
48	3137
49	3373
50	3733
51	3797

[1, 4, 6, 8, 9, 13, 17, 22, 25, 27, 29, 31, 32, 33, 35, 43, 47, 52, 55, 57, 59, 67, 71, 72, 75, 77, 79, 83, 97, 137, 173, 223, 233, 237, 313, 317, 337, 353, 379, 523, 537, 673, 733, 737, 773, 797, 1373, 3137, 3373, 3733, 3797]

cp's OEIS Frontend

A213308 Numbers with exactly one nonprime substring (substrings with leading zeros are considered to be nonprime).

Table of values

List of values