A298855 - cp's OEIS frontend

A298855 Squarefree semiprimes pq for which the symmetric representation of sigma(pq) has four parts, in increasing order.

n	a(n)
1	21
2	33
3	39
4	51
5	55
6	57
7	65
8	69
9	85
10	87
11	93
12	95
13	111
14	115
15	119
16	123
17	129
18	133
19	141
20	145
21	155
22	159
23	161
24	177
25	183
26	185
27	201
28	203
29	205
30	213
31	215
32	217
33	219
34	235
35	237
36	249
37	253
38	259
39	265
40	267
41	287
42	291
43	295
44	301
45	303
46	305
47	309
48	319
49	321
50	327
51	329
52	335
53	339
54	341
55	355
56	365
57	371
58	377
59	381
60	393
61	395

[21, 33, 39, 51, 55, 57, 65, 69, 85, 87, 93, 95, 111, 115, 119, 123, 129, 133, 141, 145, 155, 159, 161, 177, 183, 185, 201, 203, 205, 213, 215, 217, 219, 235, 237, 249, 253, 259, 265, 267, 287, 291, 295, 301, 303, 305, 309, 319, 321, 327, 329, 335, 339, 341, 355, 365, 371, 377, 381, 393, 395]

cp's OEIS Frontend

A298855 Squarefree semiprimes pq for which the symmetric representation of sigma(pq) has four parts, in increasing order.

Table of values

List of values

n	a(n)
1	21
2	33
3	39
4	51
5	55
6	57
7	65
8	69
9	85
10	87
11	93
12	95
13	111
14	115
15	119
16	123
17	129
18	133
19	141
20	145
21	155
22	159
23	161
24	177
25	183
26	185
27	201
28	203
29	205
30	213
31	215
32	217
33	219
34	235
35	237
36	249
37	253
38	259
39	265
40	267
41	287
42	291
43	295
44	301
45	303
46	305
47	309
48	319
49	321
50	327
51	329
52	335
53	339
54	341
55	355
56	365
57	371
58	377
59	381
60	393
61	395

n	a(n)
1	21
2	33
3	39
4	51
5	55
6	57
7	65
8	69
9	85
10	87
11	93
12	95
13	111
14	115
15	119
16	123
17	129
18	133
19	141
20	145
21	155
22	159
23	161
24	177
25	183
26	185
27	201
28	203
29	205
30	213
31	215
32	217
33	219
34	235
35	237
36	249
37	253
38	259
39	265
40	267
41	287
42	291
43	295
44	301
45	303
46	305
47	309
48	319
49	321
50	327
51	329
52	335
53	339
54	341
55	355
56	365
57	371
58	377
59	381
60	393
61	395

cp's OEIS Frontend

A298855 Squarefree semiprimes p*q for which the symmetric representation of sigma(p*q) has four parts, in increasing order.

Table of values

List of values

A298855 Squarefree semiprimes pq for which the symmetric representation of sigma(pq) has four parts, in increasing order.

n	a(n)
1	21
2	33
3	39
4	51
5	55
6	57
7	65
8	69
9	85
10	87
11	93
12	95
13	111
14	115
15	119
16	123
17	129
18	133
19	141
20	145
21	155
22	159
23	161
24	177
25	183
26	185
27	201
28	203
29	205
30	213
31	215
32	217
33	219
34	235
35	237
36	249
37	253
38	259
39	265
40	267
41	287
42	291
43	295
44	301
45	303
46	305
47	309
48	319
49	321
50	327
51	329
52	335
53	339
54	341
55	355
56	365
57	371
58	377
59	381
60	393
61	395