A356555 - cp's OEIS frontend

A356555 Irregular triangle T(n, k), n > 0, k = 1..A080221(n) read by rows; the n-th row contains, in ascending order, the bases b from 2..n+1 where the sum of digits of n divides n.

n	a(n)
1	2
2	2
3	3
4	3
5	4
6	2
7	3
8	4
9	5
10	5
11	6
12	2
13	3
14	4
15	5
16	6
17	7
18	7
19	8
20	2
21	3
22	4
23	5
24	7
25	8
26	9
27	3
28	4
29	7
30	9
31	10
32	2
33	3
34	5
35	6
36	9
37	10
38	11
39	11
40	12
41	2
42	3
43	4
44	5
45	6
46	7
47	9
48	10
49	11
50	12
51	13
52	13
53	14
54	7
55	8
56	13
57	14
58	15
59	3
60	5
61	6
62	7
63	11
64	13
65	15
66	16
67	2
68	3
69	4
70	5
71	7
72	8
73	9
74	13
75	15
76	16
77	17
78	17
79	18

[2, 2, 3, 3, 4, 2, 3, 4, 5, 5, 6, 2, 3, 4, 5, 6, 7, 7, 8, 2, 3, 4, 5, 7, 8, 9, 3, 4, 7, 9, 10, 2, 3, 5, 6, 9, 10, 11, 11, 12, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 13, 14, 7, 8, 13, 14, 15, 3, 5, 6, 7, 11, 13, 15, 16, 2, 3, 4, 5, 7, 8, 9, 13, 15, 16, 17, 17, 18]

cp's OEIS Frontend

A356555 Irregular triangle T(n, k), n > 0, k = 1..A080221(n) read by rows; the n-th row contains, in ascending order, the bases b from 2..n+1 where the sum of digits of n divides n.

Table of values

List of values

n	a(n)
1	2
2	2
3	3
4	3
5	4
6	2
7	3
8	4
9	5
10	5
11	6
12	2
13	3
14	4
15	5
16	6
17	7
18	7
19	8
20	2
21	3
22	4
23	5
24	7
25	8
26	9
27	3
28	4
29	7
30	9
31	10
32	2
33	3
34	5
35	6
36	9
37	10
38	11
39	11
40	12
41	2
42	3
43	4
44	5
45	6
46	7
47	9
48	10
49	11
50	12
51	13
52	13
53	14
54	7
55	8
56	13
57	14
58	15
59	3
60	5
61	6
62	7
63	11
64	13
65	15
66	16
67	2
68	3
69	4
70	5
71	7
72	8
73	9
74	13
75	15
76	16
77	17
78	17
79	18

n	a(n)
1	2
2	2
3	3
4	3
5	4
6	2
7	3
8	4
9	5
10	5
11	6
12	2
13	3
14	4
15	5
16	6
17	7
18	7
19	8
20	2
21	3
22	4
23	5
24	7
25	8
26	9
27	3
28	4
29	7
30	9
31	10
32	2
33	3
34	5
35	6
36	9
37	10
38	11
39	11
40	12
41	2
42	3
43	4
44	5
45	6
46	7
47	9
48	10
49	11
50	12
51	13
52	13
53	14
54	7
55	8
56	13
57	14
58	15
59	3
60	5
61	6
62	7
63	11
64	13
65	15
66	16
67	2
68	3
69	4
70	5
71	7
72	8
73	9
74	13
75	15
76	16
77	17
78	17
79	18

n	a(n)
1	2
2	2
3	3
4	3
5	4
6	2
7	3
8	4
9	5
10	5
11	6
12	2
13	3
14	4
15	5
16	6
17	7
18	7
19	8
20	2
21	3
22	4
23	5
24	7
25	8
26	9
27	3
28	4
29	7
30	9
31	10
32	2
33	3
34	5
35	6
36	9
37	10
38	11
39	11
40	12
41	2
42	3
43	4
44	5
45	6
46	7
47	9
48	10
49	11
50	12
51	13
52	13
53	14
54	7
55	8
56	13
57	14
58	15
59	3
60	5
61	6
62	7
63	11
64	13
65	15
66	16
67	2
68	3
69	4
70	5
71	7
72	8
73	9
74	13
75	15
76	16
77	17
78	17
79	18