A242640 - cp's OEIS frontend

A242640 Triangle read by rows: T(s,n) (1 <= s <= n) = Sum_{d|n, d <= s} d^2 + s*Sum_{d|n, d>s} d.

n	a(n)
1	1
2	3
3	5
4	4
5	7
6	10
7	7
8	13
9	17
10	21
11	6
12	11
13	16
14	21
15	26
16	12
17	23
18	32
19	38
20	44
21	50
22	8
23	15
24	22
25	29
26	36
27	43
28	50
29	15
30	29
31	41
32	53
33	61
34	69
35	77
36	85
37	13
38	25
39	37
40	46
41	55
42	64
43	73
44	82
45	91
46	18
47	35
48	50
49	65
50	80
51	90
52	100
53	110
54	120
55	130
56	12
57	23
58	34
59	45
60	56
61	67
62	78
63	89
64	100
65	111
66	122
67	28
68	55
69	80
70	102
71	120
72	138
73	150
74	162
75	174
76	186
77	198
78	210

[1, 3, 5, 4, 7, 10, 7, 13, 17, 21, 6, 11, 16, 21, 26, 12, 23, 32, 38, 44, 50, 8, 15, 22, 29, 36, 43, 50, 15, 29, 41, 53, 61, 69, 77, 85, 13, 25, 37, 46, 55, 64, 73, 82, 91, 18, 35, 50, 65, 80, 90, 100, 110, 120, 130, 12, 23, 34, 45, 56, 67, 78, 89, 100, 111, 122, 28, 55, 80, 102, 120, 138, 150, 162, 174, 186, 198, 210]

cp's OEIS Frontend

A242640 Triangle read by rows: T(s,n) (1 <= s <= n) = Sum_{d|n, d <= s} d^2 + s*Sum_{d|n, d>s} d.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	4
5	7
6	10
7	7
8	13
9	17
10	21
11	6
12	11
13	16
14	21
15	26
16	12
17	23
18	32
19	38
20	44
21	50
22	8
23	15
24	22
25	29
26	36
27	43
28	50
29	15
30	29
31	41
32	53
33	61
34	69
35	77
36	85
37	13
38	25
39	37
40	46
41	55
42	64
43	73
44	82
45	91
46	18
47	35
48	50
49	65
50	80
51	90
52	100
53	110
54	120
55	130
56	12
57	23
58	34
59	45
60	56
61	67
62	78
63	89
64	100
65	111
66	122
67	28
68	55
69	80
70	102
71	120
72	138
73	150
74	162
75	174
76	186
77	198
78	210

n	a(n)
1	1
2	3
3	5
4	4
5	7
6	10
7	7
8	13
9	17
10	21
11	6
12	11
13	16
14	21
15	26
16	12
17	23
18	32
19	38
20	44
21	50
22	8
23	15
24	22
25	29
26	36
27	43
28	50
29	15
30	29
31	41
32	53
33	61
34	69
35	77
36	85
37	13
38	25
39	37
40	46
41	55
42	64
43	73
44	82
45	91
46	18
47	35
48	50
49	65
50	80
51	90
52	100
53	110
54	120
55	130
56	12
57	23
58	34
59	45
60	56
61	67
62	78
63	89
64	100
65	111
66	122
67	28
68	55
69	80
70	102
71	120
72	138
73	150
74	162
75	174
76	186
77	198
78	210

n	a(n)
1	1
2	3
3	5
4	4
5	7
6	10
7	7
8	13
9	17
10	21
11	6
12	11
13	16
14	21
15	26
16	12
17	23
18	32
19	38
20	44
21	50
22	8
23	15
24	22
25	29
26	36
27	43
28	50
29	15
30	29
31	41
32	53
33	61
34	69
35	77
36	85
37	13
38	25
39	37
40	46
41	55
42	64
43	73
44	82
45	91
46	18
47	35
48	50
49	65
50	80
51	90
52	100
53	110
54	120
55	130
56	12
57	23
58	34
59	45
60	56
61	67
62	78
63	89
64	100
65	111
66	122
67	28
68	55
69	80
70	102
71	120
72	138
73	150
74	162
75	174
76	186
77	198
78	210