A321480 - cp's OEIS frontend

A321480 Zeroless analog of triangular numbers (version 2): a(0) = 0, and for any n > 0, a(n) = noz(1 + noz(2 + ... + noz((n-1) + n))), where noz(n) = A004719(n) omits the zeros from n.

n	a(n)
0	0
1	1
2	3
3	6
4	1
5	15
6	3
7	28
8	9
9	18
10	19
11	39
12	6
13	28
14	15
15	12
16	1
17	9
18	99
19	37
20	39
21	177
22	64
23	69
24	39
25	19
26	72
27	99
28	37
29	12
30	69
31	64
32	87
33	12
34	289
35	27
36	54
37	82
38	39
39	42
40	19
41	6
42	57
43	37
44	27
45	54
46	82
47	12
48	69
49	64
50	69
51	12
52	64
53	27
54	27
55	82
56	12
57	87
58	289
59	69
60	39
61	289
62	72
63	99
64	64
65	57
66	24

[0, 1, 3, 6, 1, 15, 3, 28, 9, 18, 19, 39, 6, 28, 15, 12, 1, 9, 99, 37, 39, 177, 64, 69, 39, 19, 72, 99, 37, 12, 69, 64, 87, 12, 289, 27, 54, 82, 39, 42, 19, 6, 57, 37, 27, 54, 82, 12, 69, 64, 69, 12, 64, 27, 27, 82, 12, 87, 289, 69, 39, 289, 72, 99, 64, 57, 24]

cp's OEIS Frontend

A321480 Zeroless analog of triangular numbers (version 2): a(0) = 0, and for any n > 0, a(n) = noz(1 + noz(2 + ... + noz((n-1) + n))), where noz(n) = A004719(n) omits the zeros from n.

Table of values

List of values

n	a(n)
0	0
1	1
2	3
3	6
4	1
5	15
6	3
7	28
8	9
9	18
10	19
11	39
12	6
13	28
14	15
15	12
16	1
17	9
18	99
19	37
20	39
21	177
22	64
23	69
24	39
25	19
26	72
27	99
28	37
29	12
30	69
31	64
32	87
33	12
34	289
35	27
36	54
37	82
38	39
39	42
40	19
41	6
42	57
43	37
44	27
45	54
46	82
47	12
48	69
49	64
50	69
51	12
52	64
53	27
54	27
55	82
56	12
57	87
58	289
59	69
60	39
61	289
62	72
63	99
64	64
65	57
66	24

n	a(n)
0	0
1	1
2	3
3	6
4	1
5	15
6	3
7	28
8	9
9	18
10	19
11	39
12	6
13	28
14	15
15	12
16	1
17	9
18	99
19	37
20	39
21	177
22	64
23	69
24	39
25	19
26	72
27	99
28	37
29	12
30	69
31	64
32	87
33	12
34	289
35	27
36	54
37	82
38	39
39	42
40	19
41	6
42	57
43	37
44	27
45	54
46	82
47	12
48	69
49	64
50	69
51	12
52	64
53	27
54	27
55	82
56	12
57	87
58	289
59	69
60	39
61	289
62	72
63	99
64	64
65	57
66	24

n	a(n)
0	0
1	1
2	3
3	6
4	1
5	15
6	3
7	28
8	9
9	18
10	19
11	39
12	6
13	28
14	15
15	12
16	1
17	9
18	99
19	37
20	39
21	177
22	64
23	69
24	39
25	19
26	72
27	99
28	37
29	12
30	69
31	64
32	87
33	12
34	289
35	27
36	54
37	82
38	39
39	42
40	19
41	6
42	57
43	37
44	27
45	54
46	82
47	12
48	69
49	64
50	69
51	12
52	64
53	27
54	27
55	82
56	12
57	87
58	289
59	69
60	39
61	289
62	72
63	99
64	64
65	57
66	24