A339578 - cp's OEIS frontend

A339578 Numbers k such that k^3 can be obtained by taking a number m that is the product of exactly three primes (cf. A014612) and deleting the central digit if m has an odd number of digits, or by deleting the central pair of digits if m has an even number of digits.

n	a(n)
1	3
2	4
3	11
4	12
5	13
6	14
7	15
8	16
9	17
10	18
11	19
12	21
13	47
14	49
15	51
16	53
17	57
18	59
19	61
20	63
21	67
22	69
23	71
24	73
25	77
26	79
27	81
28	83
29	87
30	89
31	91
32	93
33	97
34	99
35	217
36	219
37	221
38	223
39	227
40	229
41	231
42	233
43	237
44	239
45	241
46	243
47	247
48	249
49	251
50	253
51	257
52	259
53	261
54	263
55	267
56	269
57	271
58	273
59	277
60	279
61	281
62	283
63	287
64	289

[3, 4, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 47, 49, 51, 53, 57, 59, 61, 63, 67, 69, 71, 73, 77, 79, 81, 83, 87, 89, 91, 93, 97, 99, 217, 219, 221, 223, 227, 229, 231, 233, 237, 239, 241, 243, 247, 249, 251, 253, 257, 259, 261, 263, 267, 269, 271, 273, 277, 279, 281, 283, 287, 289]

cp's OEIS Frontend

A339578 Numbers k such that k^3 can be obtained by taking a number m that is the product of exactly three primes (cf. A014612) and deleting the central digit if m has an odd number of digits, or by deleting the central pair of digits if m has an even number of digits.

Table of values

List of values

n	a(n)
1	3
2	4
3	11
4	12
5	13
6	14
7	15
8	16
9	17
10	18
11	19
12	21
13	47
14	49
15	51
16	53
17	57
18	59
19	61
20	63
21	67
22	69
23	71
24	73
25	77
26	79
27	81
28	83
29	87
30	89
31	91
32	93
33	97
34	99
35	217
36	219
37	221
38	223
39	227
40	229
41	231
42	233
43	237
44	239
45	241
46	243
47	247
48	249
49	251
50	253
51	257
52	259
53	261
54	263
55	267
56	269
57	271
58	273
59	277
60	279
61	281
62	283
63	287
64	289

n	a(n)
1	3
2	4
3	11
4	12
5	13
6	14
7	15
8	16
9	17
10	18
11	19
12	21
13	47
14	49
15	51
16	53
17	57
18	59
19	61
20	63
21	67
22	69
23	71
24	73
25	77
26	79
27	81
28	83
29	87
30	89
31	91
32	93
33	97
34	99
35	217
36	219
37	221
38	223
39	227
40	229
41	231
42	233
43	237
44	239
45	241
46	243
47	247
48	249
49	251
50	253
51	257
52	259
53	261
54	263
55	267
56	269
57	271
58	273
59	277
60	279
61	281
62	283
63	287
64	289

n	a(n)
1	3
2	4
3	11
4	12
5	13
6	14
7	15
8	16
9	17
10	18
11	19
12	21
13	47
14	49
15	51
16	53
17	57
18	59
19	61
20	63
21	67
22	69
23	71
24	73
25	77
26	79
27	81
28	83
29	87
30	89
31	91
32	93
33	97
34	99
35	217
36	219
37	221
38	223
39	227
40	229
41	231
42	233
43	237
44	239
45	241
46	243
47	247
48	249
49	251
50	253
51	257
52	259
53	261
54	263
55	267
56	269
57	271
58	273
59	277
60	279
61	281
62	283
63	287
64	289