A294721 - cp's OEIS frontend

A294721 Irregular triangle read by rows: T(n,k) = n if k is the largest divisor of n <= sqrt(n), otherwise T(n,k) = 0. The first element of column k is in row k^2, n>=1, k>=1.

n	a(n)
1	1
2	2
3	3
4	0
5	4
6	5
7	0
8	0
9	6
10	7
11	0
12	0
13	8
14	0
15	0
16	9
17	0
18	10
19	0
20	11
21	0
22	0
23	0
24	0
25	12
26	13
27	0
28	0
29	0
30	14
31	0
32	0
33	0
34	15
35	0
36	0
37	0
38	16
39	17
40	0
41	0
42	0
43	0
44	0
45	18
46	0
47	19
48	0
49	0
50	0
51	0
52	0
53	0
54	20
55	0
56	0
57	21
58	0
59	0
60	22
61	0
62	0
63	23
64	0
65	0
66	0
67	0
68	0
69	0
70	24
71	0
72	0
73	0
74	0
75	25
76	0
77	26
78	0
79	0
80	0
81	0
82	0
83	27
84	0
85	0
86	0
87	0
88	0
89	28
90	0
91	29
92	0
93	0
94	0
95	0
96	0
97	0
98	0
99	0
100	30

[1, 2, 3, 0, 4, 5, 0, 0, 6, 7, 0, 0, 8, 0, 0, 9, 0, 10, 0, 11, 0, 0, 0, 0, 12, 13, 0, 0, 0, 14, 0, 0, 0, 15, 0, 0, 0, 16, 17, 0, 0, 0, 0, 0, 18, 0, 19, 0, 0, 0, 0, 0, 0, 20, 0, 0, 21, 0, 0, 22, 0, 0, 23, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 25, 0, 26, 0, 0, 0, 0, 0, 27, 0, 0, 0, 0, 0, 28, 0, 29, 0, 0, 0, 0, 0, 0, 0, 0, 30]

cp's OEIS Frontend

A294721 Irregular triangle read by rows: T(n,k) = n if k is the largest divisor of n <= sqrt(n), otherwise T(n,k) = 0. The first element of column k is in row k^2, n>=1, k>=1.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	0
5	4
6	5
7	0
8	0
9	6
10	7
11	0
12	0
13	8
14	0
15	0
16	9
17	0
18	10
19	0
20	11
21	0
22	0
23	0
24	0
25	12
26	13
27	0
28	0
29	0
30	14
31	0
32	0
33	0
34	15
35	0
36	0
37	0
38	16
39	17
40	0
41	0
42	0
43	0
44	0
45	18
46	0
47	19
48	0
49	0
50	0
51	0
52	0
53	0
54	20
55	0
56	0
57	21
58	0
59	0
60	22
61	0
62	0
63	23
64	0
65	0
66	0
67	0
68	0
69	0
70	24
71	0
72	0
73	0
74	0
75	25
76	0
77	26
78	0
79	0
80	0
81	0
82	0
83	27
84	0
85	0
86	0
87	0
88	0
89	28
90	0
91	29
92	0
93	0
94	0
95	0
96	0
97	0
98	0
99	0
100	30

n	a(n)
1	1
2	2
3	3
4	0
5	4
6	5
7	0
8	0
9	6
10	7
11	0
12	0
13	8
14	0
15	0
16	9
17	0
18	10
19	0
20	11
21	0
22	0
23	0
24	0
25	12
26	13
27	0
28	0
29	0
30	14
31	0
32	0
33	0
34	15
35	0
36	0
37	0
38	16
39	17
40	0
41	0
42	0
43	0
44	0
45	18
46	0
47	19
48	0
49	0
50	0
51	0
52	0
53	0
54	20
55	0
56	0
57	21
58	0
59	0
60	22
61	0
62	0
63	23
64	0
65	0
66	0
67	0
68	0
69	0
70	24
71	0
72	0
73	0
74	0
75	25
76	0
77	26
78	0
79	0
80	0
81	0
82	0
83	27
84	0
85	0
86	0
87	0
88	0
89	28
90	0
91	29
92	0
93	0
94	0
95	0
96	0
97	0
98	0
99	0
100	30

n	a(n)
1	1
2	2
3	3
4	0
5	4
6	5
7	0
8	0
9	6
10	7
11	0
12	0
13	8
14	0
15	0
16	9
17	0
18	10
19	0
20	11
21	0
22	0
23	0
24	0
25	12
26	13
27	0
28	0
29	0
30	14
31	0
32	0
33	0
34	15
35	0
36	0
37	0
38	16
39	17
40	0
41	0
42	0
43	0
44	0
45	18
46	0
47	19
48	0
49	0
50	0
51	0
52	0
53	0
54	20
55	0
56	0
57	21
58	0
59	0
60	22
61	0
62	0
63	23
64	0
65	0
66	0
67	0
68	0
69	0
70	24
71	0
72	0
73	0
74	0
75	25
76	0
77	26
78	0
79	0
80	0
81	0
82	0
83	27
84	0
85	0
86	0
87	0
88	0
89	28
90	0
91	29
92	0
93	0
94	0
95	0
96	0
97	0
98	0
99	0
100	30