A107449 - cp's OEIS frontend

A107449 Irregular triangle T(n, k) = 10 - ( (b(n) + k^2 + k + 1) mod 10 ), where b(n) = A056486(n-1) - (1/2)*[n=1], for n >= 1 and 1 <= k <= b(n) - 1, read by rows.

n	a(n)
1	5
2	3
3	9
4	3
5	7
6	3
7	7
8	9
9	9
10	7
11	3
12	7
13	9
14	1
15	7
16	1
17	3
18	3
19	1
20	7
21	1
22	3
23	3
24	1
25	7
26	1
27	3
28	3
29	7
30	3
31	7
32	9
33	9
34	7
35	3
36	7
37	9
38	9
39	7
40	3
41	7
42	9
43	9
44	7
45	3
46	7
47	9
48	9
49	7
50	3
51	7
52	9
53	9
54	7
55	3
56	7
57	9
58	9
59	7
60	3
61	7
62	9
63	9
64	7
65	3
66	7
67	9
68	3
69	9
70	3
71	5
72	5
73	3
74	9
75	3
76	5
77	5
78	3
79	9
80	3
81	5
82	5
83	3
84	9
85	3
86	5
87	5
88	3
89	9
90	3
91	5
92	5
93	3
94	9
95	3
96	5
97	5
98	3
99	9
100	3
101	5
102	5
103	3
104	9
105	3

[5, 3, 9, 3, 7, 3, 7, 9, 9, 7, 3, 7, 9, 1, 7, 1, 3, 3, 1, 7, 1, 3, 3, 1, 7, 1, 3, 3, 7, 3, 7, 9, 9, 7, 3, 7, 9, 9, 7, 3, 7, 9, 9, 7, 3, 7, 9, 9, 7, 3, 7, 9, 9, 7, 3, 7, 9, 9, 7, 3, 7, 9, 9, 7, 3, 7, 9, 3, 9, 3, 5, 5, 3, 9, 3, 5, 5, 3, 9, 3, 5, 5, 3, 9, 3, 5, 5, 3, 9, 3, 5, 5, 3, 9, 3, 5, 5, 3, 9, 3, 5, 5, 3, 9, 3]

cp's OEIS Frontend

A107449 Irregular triangle T(n, k) = 10 - ( (b(n) + k^2 + k + 1) mod 10 ), where b(n) = A056486(n-1) - (1/2)*[n=1], for n >= 1 and 1 <= k <= b(n) - 1, read by rows.

Table of values

List of values

n	a(n)
1	5
2	3
3	9
4	3
5	7
6	3
7	7
8	9
9	9
10	7
11	3
12	7
13	9
14	1
15	7
16	1
17	3
18	3
19	1
20	7
21	1
22	3
23	3
24	1
25	7
26	1
27	3
28	3
29	7
30	3
31	7
32	9
33	9
34	7
35	3
36	7
37	9
38	9
39	7
40	3
41	7
42	9
43	9
44	7
45	3
46	7
47	9
48	9
49	7
50	3
51	7
52	9
53	9
54	7
55	3
56	7
57	9
58	9
59	7
60	3
61	7
62	9
63	9
64	7
65	3
66	7
67	9
68	3
69	9
70	3
71	5
72	5
73	3
74	9
75	3
76	5
77	5
78	3
79	9
80	3
81	5
82	5
83	3
84	9
85	3
86	5
87	5
88	3
89	9
90	3
91	5
92	5
93	3
94	9
95	3
96	5
97	5
98	3
99	9
100	3
101	5
102	5
103	3
104	9
105	3

n	a(n)
1	5
2	3
3	9
4	3
5	7
6	3
7	7
8	9
9	9
10	7
11	3
12	7
13	9
14	1
15	7
16	1
17	3
18	3
19	1
20	7
21	1
22	3
23	3
24	1
25	7
26	1
27	3
28	3
29	7
30	3
31	7
32	9
33	9
34	7
35	3
36	7
37	9
38	9
39	7
40	3
41	7
42	9
43	9
44	7
45	3
46	7
47	9
48	9
49	7
50	3
51	7
52	9
53	9
54	7
55	3
56	7
57	9
58	9
59	7
60	3
61	7
62	9
63	9
64	7
65	3
66	7
67	9
68	3
69	9
70	3
71	5
72	5
73	3
74	9
75	3
76	5
77	5
78	3
79	9
80	3
81	5
82	5
83	3
84	9
85	3
86	5
87	5
88	3
89	9
90	3
91	5
92	5
93	3
94	9
95	3
96	5
97	5
98	3
99	9
100	3
101	5
102	5
103	3
104	9
105	3

n	a(n)
1	5
2	3
3	9
4	3
5	7
6	3
7	7
8	9
9	9
10	7
11	3
12	7
13	9
14	1
15	7
16	1
17	3
18	3
19	1
20	7
21	1
22	3
23	3
24	1
25	7
26	1
27	3
28	3
29	7
30	3
31	7
32	9
33	9
34	7
35	3
36	7
37	9
38	9
39	7
40	3
41	7
42	9
43	9
44	7
45	3
46	7
47	9
48	9
49	7
50	3
51	7
52	9
53	9
54	7
55	3
56	7
57	9
58	9
59	7
60	3
61	7
62	9
63	9
64	7
65	3
66	7
67	9
68	3
69	9
70	3
71	5
72	5
73	3
74	9
75	3
76	5
77	5
78	3
79	9
80	3
81	5
82	5
83	3
84	9
85	3
86	5
87	5
88	3
89	9
90	3
91	5
92	5
93	3
94	9
95	3
96	5
97	5
98	3
99	9
100	3
101	5
102	5
103	3
104	9
105	3