A272400 - cp's OEIS frontend

A272400 Square array read by antidiagonals upwards in which T(n,k) is the product of the n-th noncomposite number and the sum of the divisors of k, n>=1, k>=1.

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	4
7	5
8	9
9	8
10	7
11	7
12	15
13	12
14	14
15	6
16	11
17	21
18	20
19	21
20	12
21	12
22	13
23	33
24	28
25	35
26	18
27	24
28	8
29	17
30	39
31	44
32	49
33	30
34	36
35	16
36	15
37	19
38	51
39	52
40	77
41	42
42	60
43	24
44	30
45	13
46	23
47	57
48	68
49	91
50	66
51	84
52	40
53	45
54	26
55	18
56	29
57	69
58	76
59	119
60	78
61	132
62	56
63	75
64	39
65	36
66	12
67	31
68	87
69	92
70	133
71	102
72	156
73	88
74	105
75	65
76	54
77	24
78	28

[1, 2, 3, 3, 6, 4, 5, 9, 8, 7, 7, 15, 12, 14, 6, 11, 21, 20, 21, 12, 12, 13, 33, 28, 35, 18, 24, 8, 17, 39, 44, 49, 30, 36, 16, 15, 19, 51, 52, 77, 42, 60, 24, 30, 13, 23, 57, 68, 91, 66, 84, 40, 45, 26, 18, 29, 69, 76, 119, 78, 132, 56, 75, 39, 36, 12, 31, 87, 92, 133, 102, 156, 88, 105, 65, 54, 24, 28]

cp's OEIS Frontend

A272400 Square array read by antidiagonals upwards in which T(n,k) is the product of the n-th noncomposite number and the sum of the divisors of k, n>=1, k>=1.

Table of values

List of values

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	4
7	5
8	9
9	8
10	7
11	7
12	15
13	12
14	14
15	6
16	11
17	21
18	20
19	21
20	12
21	12
22	13
23	33
24	28
25	35
26	18
27	24
28	8
29	17
30	39
31	44
32	49
33	30
34	36
35	16
36	15
37	19
38	51
39	52
40	77
41	42
42	60
43	24
44	30
45	13
46	23
47	57
48	68
49	91
50	66
51	84
52	40
53	45
54	26
55	18
56	29
57	69
58	76
59	119
60	78
61	132
62	56
63	75
64	39
65	36
66	12
67	31
68	87
69	92
70	133
71	102
72	156
73	88
74	105
75	65
76	54
77	24
78	28

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	4
7	5
8	9
9	8
10	7
11	7
12	15
13	12
14	14
15	6
16	11
17	21
18	20
19	21
20	12
21	12
22	13
23	33
24	28
25	35
26	18
27	24
28	8
29	17
30	39
31	44
32	49
33	30
34	36
35	16
36	15
37	19
38	51
39	52
40	77
41	42
42	60
43	24
44	30
45	13
46	23
47	57
48	68
49	91
50	66
51	84
52	40
53	45
54	26
55	18
56	29
57	69
58	76
59	119
60	78
61	132
62	56
63	75
64	39
65	36
66	12
67	31
68	87
69	92
70	133
71	102
72	156
73	88
74	105
75	65
76	54
77	24
78	28

n	a(n)
1	1
2	2
3	3
4	3
5	6
6	4
7	5
8	9
9	8
10	7
11	7
12	15
13	12
14	14
15	6
16	11
17	21
18	20
19	21
20	12
21	12
22	13
23	33
24	28
25	35
26	18
27	24
28	8
29	17
30	39
31	44
32	49
33	30
34	36
35	16
36	15
37	19
38	51
39	52
40	77
41	42
42	60
43	24
44	30
45	13
46	23
47	57
48	68
49	91
50	66
51	84
52	40
53	45
54	26
55	18
56	29
57	69
58	76
59	119
60	78
61	132
62	56
63	75
64	39
65	36
66	12
67	31
68	87
69	92
70	133
71	102
72	156
73	88
74	105
75	65
76	54
77	24
78	28