A257253 - cp's OEIS frontend

A257253 Square array A(row,col) = (1/2) * (A083221(row,col+1) - A083221(row,col)): half of the first differences of each row of array constructed from the sieve of Eratosthenes.

n	a(n)
1	1
2	1
3	3
4	1
5	3
6	10
7	1
8	3
9	5
10	21
11	1
12	3
13	10
14	14
15	55
16	1
17	3
18	5
19	7
20	11
21	78
22	1
23	3
24	10
25	14
26	22
27	26
28	136
29	1
30	3
31	5
32	7
33	11
34	13
35	17
36	171
37	1
38	3
39	10
40	14
41	22
42	26
43	34
44	38
45	253
46	1
47	3
48	5
49	21
50	33
51	39
52	51
53	57
54	69
55	406
56	1
57	3
58	10
59	7
60	11
61	13
62	17
63	19
64	23
65	29
66	465

[1, 1, 3, 1, 3, 10, 1, 3, 5, 21, 1, 3, 10, 14, 55, 1, 3, 5, 7, 11, 78, 1, 3, 10, 14, 22, 26, 136, 1, 3, 5, 7, 11, 13, 17, 171, 1, 3, 10, 14, 22, 26, 34, 38, 253, 1, 3, 5, 21, 33, 39, 51, 57, 69, 406, 1, 3, 10, 7, 11, 13, 17, 19, 23, 29, 465]

cp's OEIS Frontend

A257253 Square array A(row,col) = (1/2) * (A083221(row,col+1) - A083221(row,col)): half of the first differences of each row of array constructed from the sieve of Eratosthenes.

Table of values

List of values

n	a(n)
1	1
2	1
3	3
4	1
5	3
6	10
7	1
8	3
9	5
10	21
11	1
12	3
13	10
14	14
15	55
16	1
17	3
18	5
19	7
20	11
21	78
22	1
23	3
24	10
25	14
26	22
27	26
28	136
29	1
30	3
31	5
32	7
33	11
34	13
35	17
36	171
37	1
38	3
39	10
40	14
41	22
42	26
43	34
44	38
45	253
46	1
47	3
48	5
49	21
50	33
51	39
52	51
53	57
54	69
55	406
56	1
57	3
58	10
59	7
60	11
61	13
62	17
63	19
64	23
65	29
66	465

n	a(n)
1	1
2	1
3	3
4	1
5	3
6	10
7	1
8	3
9	5
10	21
11	1
12	3
13	10
14	14
15	55
16	1
17	3
18	5
19	7
20	11
21	78
22	1
23	3
24	10
25	14
26	22
27	26
28	136
29	1
30	3
31	5
32	7
33	11
34	13
35	17
36	171
37	1
38	3
39	10
40	14
41	22
42	26
43	34
44	38
45	253
46	1
47	3
48	5
49	21
50	33
51	39
52	51
53	57
54	69
55	406
56	1
57	3
58	10
59	7
60	11
61	13
62	17
63	19
64	23
65	29
66	465

n	a(n)
1	1
2	1
3	3
4	1
5	3
6	10
7	1
8	3
9	5
10	21
11	1
12	3
13	10
14	14
15	55
16	1
17	3
18	5
19	7
20	11
21	78
22	1
23	3
24	10
25	14
26	22
27	26
28	136
29	1
30	3
31	5
32	7
33	11
34	13
35	17
36	171
37	1
38	3
39	10
40	14
41	22
42	26
43	34
44	38
45	253
46	1
47	3
48	5
49	21
50	33
51	39
52	51
53	57
54	69
55	406
56	1
57	3
58	10
59	7
60	11
61	13
62	17
63	19
64	23
65	29
66	465