A309131 - cp's OEIS frontend

A309131 Triangle read by rows: T(n, k) = (n - k)*prime(1 + k), with 0 <= k < n.

n	a(n)
1	2
2	4
3	3
4	6
5	6
6	5
7	8
8	9
9	10
10	7
11	10
12	12
13	15
14	14
15	11
16	12
17	15
18	20
19	21
20	22
21	13
22	14
23	18
24	25
25	28
26	33
27	26
28	17
29	16
30	21
31	30
32	35
33	44
34	39
35	34
36	19
37	18
38	24
39	35
40	42
41	55
42	52
43	51
44	38
45	23
46	20
47	27
48	40
49	49
50	66
51	65
52	68
53	57
54	46
55	29
56	22
57	30
58	45
59	56
60	77
61	78
62	85
63	76
64	69
65	58
66	31

[2, 4, 3, 6, 6, 5, 8, 9, 10, 7, 10, 12, 15, 14, 11, 12, 15, 20, 21, 22, 13, 14, 18, 25, 28, 33, 26, 17, 16, 21, 30, 35, 44, 39, 34, 19, 18, 24, 35, 42, 55, 52, 51, 38, 23, 20, 27, 40, 49, 66, 65, 68, 57, 46, 29, 22, 30, 45, 56, 77, 78, 85, 76, 69, 58, 31]

cp's OEIS Frontend

A309131 Triangle read by rows: T(n, k) = (n - k)*prime(1 + k), with 0 <= k < n.

Table of values

List of values

n	a(n)
1	2
2	4
3	3
4	6
5	6
6	5
7	8
8	9
9	10
10	7
11	10
12	12
13	15
14	14
15	11
16	12
17	15
18	20
19	21
20	22
21	13
22	14
23	18
24	25
25	28
26	33
27	26
28	17
29	16
30	21
31	30
32	35
33	44
34	39
35	34
36	19
37	18
38	24
39	35
40	42
41	55
42	52
43	51
44	38
45	23
46	20
47	27
48	40
49	49
50	66
51	65
52	68
53	57
54	46
55	29
56	22
57	30
58	45
59	56
60	77
61	78
62	85
63	76
64	69
65	58
66	31

n	a(n)
1	2
2	4
3	3
4	6
5	6
6	5
7	8
8	9
9	10
10	7
11	10
12	12
13	15
14	14
15	11
16	12
17	15
18	20
19	21
20	22
21	13
22	14
23	18
24	25
25	28
26	33
27	26
28	17
29	16
30	21
31	30
32	35
33	44
34	39
35	34
36	19
37	18
38	24
39	35
40	42
41	55
42	52
43	51
44	38
45	23
46	20
47	27
48	40
49	49
50	66
51	65
52	68
53	57
54	46
55	29
56	22
57	30
58	45
59	56
60	77
61	78
62	85
63	76
64	69
65	58
66	31

n	a(n)
1	2
2	4
3	3
4	6
5	6
6	5
7	8
8	9
9	10
10	7
11	10
12	12
13	15
14	14
15	11
16	12
17	15
18	20
19	21
20	22
21	13
22	14
23	18
24	25
25	28
26	33
27	26
28	17
29	16
30	21
31	30
32	35
33	44
34	39
35	34
36	19
37	18
38	24
39	35
40	42
41	55
42	52
43	51
44	38
45	23
46	20
47	27
48	40
49	49
50	66
51	65
52	68
53	57
54	46
55	29
56	22
57	30
58	45
59	56
60	77
61	78
62	85
63	76
64	69
65	58
66	31