A038457 - cp's OEIS frontend

A038457 |First digit-last digit| for triangular numbers.

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

[0, 0, 0, 0, 1, 4, 1, 6, 3, 1, 0, 0, 1, 8, 4, 1, 5, 2, 0, 1, 2, 1, 1, 4, 3, 2, 2, 5, 2, 1, 1, 2, 3, 4, 0, 6, 0, 4, 6, 7, 8, 7, 6, 3, 9, 4, 0, 7, 5, 4, 4, 5, 7, 0, 4, 1, 5, 2, 0, 1, 1, 0, 2, 4, 2, 3, 1, 6, 4, 3, 3, 4, 6, 1, 3, 2, 4, 0, 2, 3, 3, 2, 0, 3, 3, 2, 2, 5, 3, 1, 1, 2, 4, 3, 1, 4, 2, 1, 3, 4, 5]

cp's OEIS Frontend

A038457 |First digit-last digit| for triangular numbers.

Table of values

List of values

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

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

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