A083140 - cp's OEIS frontend

A083140 Sieve of Eratosthenes arranged as an array and read by antidiagonals in the up direction; n-th row has property that smallest prime factor is prime(n).

n	a(n)
2	2
3	3
4	4
5	5
6	9
7	6
8	7
9	25
10	15
11	8
12	11
13	49
14	35
15	21
16	10
17	13
18	121
19	77
20	55
21	27
22	12
23	17
24	169
25	143
26	91
27	65
28	33
29	14
30	19
31	289
32	221
33	187
34	119
35	85
36	39
37	16
38	23
39	361
40	323
41	247
42	209
43	133
44	95
45	45
46	18
47	29
48	529
49	437
50	391
51	299
52	253
53	161
54	115
55	51
56	20
57	31
58	841
59	667
60	551
61	493
62	377
63	319
64	203
65	125
66	57
67	22

[2, 3, 4, 5, 9, 6, 7, 25, 15, 8, 11, 49, 35, 21, 10, 13, 121, 77, 55, 27, 12, 17, 169, 143, 91, 65, 33, 14, 19, 289, 221, 187, 119, 85, 39, 16, 23, 361, 323, 247, 209, 133, 95, 45, 18, 29, 529, 437, 391, 299, 253, 161, 115, 51, 20, 31, 841, 667, 551, 493, 377, 319, 203, 125, 57, 22]

cp's OEIS Frontend

A083140 Sieve of Eratosthenes arranged as an array and read by antidiagonals in the up direction; n-th row has property that smallest prime factor is prime(n).

Table of values

List of values

n	a(n)
2	2
3	3
4	4
5	5
6	9
7	6
8	7
9	25
10	15
11	8
12	11
13	49
14	35
15	21
16	10
17	13
18	121
19	77
20	55
21	27
22	12
23	17
24	169
25	143
26	91
27	65
28	33
29	14
30	19
31	289
32	221
33	187
34	119
35	85
36	39
37	16
38	23
39	361
40	323
41	247
42	209
43	133
44	95
45	45
46	18
47	29
48	529
49	437
50	391
51	299
52	253
53	161
54	115
55	51
56	20
57	31
58	841
59	667
60	551
61	493
62	377
63	319
64	203
65	125
66	57
67	22

n	a(n)
2	2
3	3
4	4
5	5
6	9
7	6
8	7
9	25
10	15
11	8
12	11
13	49
14	35
15	21
16	10
17	13
18	121
19	77
20	55
21	27
22	12
23	17
24	169
25	143
26	91
27	65
28	33
29	14
30	19
31	289
32	221
33	187
34	119
35	85
36	39
37	16
38	23
39	361
40	323
41	247
42	209
43	133
44	95
45	45
46	18
47	29
48	529
49	437
50	391
51	299
52	253
53	161
54	115
55	51
56	20
57	31
58	841
59	667
60	551
61	493
62	377
63	319
64	203
65	125
66	57
67	22

n	a(n)
2	2
3	3
4	4
5	5
6	9
7	6
8	7
9	25
10	15
11	8
12	11
13	49
14	35
15	21
16	10
17	13
18	121
19	77
20	55
21	27
22	12
23	17
24	169
25	143
26	91
27	65
28	33
29	14
30	19
31	289
32	221
33	187
34	119
35	85
36	39
37	16
38	23
39	361
40	323
41	247
42	209
43	133
44	95
45	45
46	18
47	29
48	529
49	437
50	391
51	299
52	253
53	161
54	115
55	51
56	20
57	31
58	841
59	667
60	551
61	493
62	377
63	319
64	203
65	125
66	57
67	22