A331821 - cp's OEIS frontend

A331821 Positive numbers k such that -k and -(k + 1) are both negabinary-Niven numbers (A331728).

n	a(n)
1	2
2	3
3	8
4	9
5	15
6	24
7	27
8	32
9	33
10	39
11	54
12	55
13	63
14	77
15	111
16	114
17	115
18	123
19	128
20	129
21	135
22	144
23	159
24	174
25	175
26	203
27	234
28	235
29	245
30	255
31	264
32	294
33	295
34	329
35	370
36	371
37	384
38	413
39	414
40	415
41	444
42	447
43	474
44	475
45	495
46	504
47	507
48	512
49	513
50	519
51	534
52	535
53	543
54	580
55	581
56	624

[2, 3, 8, 9, 15, 24, 27, 32, 33, 39, 54, 55, 63, 77, 111, 114, 115, 123, 128, 129, 135, 144, 159, 174, 175, 203, 234, 235, 245, 255, 264, 294, 295, 329, 370, 371, 384, 413, 414, 415, 444, 447, 474, 475, 495, 504, 507, 512, 513, 519, 534, 535, 543, 580, 581, 624]

cp's OEIS Frontend

A331821 Positive numbers k such that -k and -(k + 1) are both negabinary-Niven numbers (A331728).

Table of values

List of values

n	a(n)
1	2
2	3
3	8
4	9
5	15
6	24
7	27
8	32
9	33
10	39
11	54
12	55
13	63
14	77
15	111
16	114
17	115
18	123
19	128
20	129
21	135
22	144
23	159
24	174
25	175
26	203
27	234
28	235
29	245
30	255
31	264
32	294
33	295
34	329
35	370
36	371
37	384
38	413
39	414
40	415
41	444
42	447
43	474
44	475
45	495
46	504
47	507
48	512
49	513
50	519
51	534
52	535
53	543
54	580
55	581
56	624

n	a(n)
1	2
2	3
3	8
4	9
5	15
6	24
7	27
8	32
9	33
10	39
11	54
12	55
13	63
14	77
15	111
16	114
17	115
18	123
19	128
20	129
21	135
22	144
23	159
24	174
25	175
26	203
27	234
28	235
29	245
30	255
31	264
32	294
33	295
34	329
35	370
36	371
37	384
38	413
39	414
40	415
41	444
42	447
43	474
44	475
45	495
46	504
47	507
48	512
49	513
50	519
51	534
52	535
53	543
54	580
55	581
56	624

n	a(n)
1	2
2	3
3	8
4	9
5	15
6	24
7	27
8	32
9	33
10	39
11	54
12	55
13	63
14	77
15	111
16	114
17	115
18	123
19	128
20	129
21	135
22	144
23	159
24	174
25	175
26	203
27	234
28	235
29	245
30	255
31	264
32	294
33	295
34	329
35	370
36	371
37	384
38	413
39	414
40	415
41	444
42	447
43	474
44	475
45	495
46	504
47	507
48	512
49	513
50	519
51	534
52	535
53	543
54	580
55	581
56	624