A087572 - cp's OEIS frontend

A087572 Smallest prime of the form n + (n-1) + (n-2) + ...(n-k), k < n, or 0 if no such prime exists.

n	a(n)
1	0
2	2
3	3
4	7
5	5
6	11
7	7
8	0
9	17
10	19
11	11
12	23
13	13
14	0
15	29
16	31
17	17
18	0
19	19
20	0
21	41
22	43
23	23
24	47
25	0
26	0
27	53
28	0
29	29
30	59
31	31
32	0
33	0
34	67
35	0
36	71
37	37
38	0
39	0
40	79
41	41
42	83
43	43
44	0
45	89
46	0
47	47
48	0
49	97
50	0
51	101
52	103
53	53
54	107
55	109
56	0
57	113
58	0
59	59
60	0
61	61
62	0
63	0
64	127
65	0
66	131
67	67
68	0
69	137
70	139
71	71
72	0
73	73
74	0
75	149
76	151
77	0

[0, 2, 3, 7, 5, 11, 7, 0, 17, 19, 11, 23, 13, 0, 29, 31, 17, 0, 19, 0, 41, 43, 23, 47, 0, 0, 53, 0, 29, 59, 31, 0, 0, 67, 0, 71, 37, 0, 0, 79, 41, 83, 43, 0, 89, 0, 47, 0, 97, 0, 101, 103, 53, 107, 109, 0, 113, 0, 59, 0, 61, 0, 0, 127, 0, 131, 67, 0, 137, 139, 71, 0, 73, 0, 149, 151, 0]

cp's OEIS Frontend

A087572 Smallest prime of the form n + (n-1) + (n-2) + ...(n-k), k < n, or 0 if no such prime exists.

Table of values

List of values

n	a(n)
1	0
2	2
3	3
4	7
5	5
6	11
7	7
8	0
9	17
10	19
11	11
12	23
13	13
14	0
15	29
16	31
17	17
18	0
19	19
20	0
21	41
22	43
23	23
24	47
25	0
26	0
27	53
28	0
29	29
30	59
31	31
32	0
33	0
34	67
35	0
36	71
37	37
38	0
39	0
40	79
41	41
42	83
43	43
44	0
45	89
46	0
47	47
48	0
49	97
50	0
51	101
52	103
53	53
54	107
55	109
56	0
57	113
58	0
59	59
60	0
61	61
62	0
63	0
64	127
65	0
66	131
67	67
68	0
69	137
70	139
71	71
72	0
73	73
74	0
75	149
76	151
77	0

n	a(n)
1	0
2	2
3	3
4	7
5	5
6	11
7	7
8	0
9	17
10	19
11	11
12	23
13	13
14	0
15	29
16	31
17	17
18	0
19	19
20	0
21	41
22	43
23	23
24	47
25	0
26	0
27	53
28	0
29	29
30	59
31	31
32	0
33	0
34	67
35	0
36	71
37	37
38	0
39	0
40	79
41	41
42	83
43	43
44	0
45	89
46	0
47	47
48	0
49	97
50	0
51	101
52	103
53	53
54	107
55	109
56	0
57	113
58	0
59	59
60	0
61	61
62	0
63	0
64	127
65	0
66	131
67	67
68	0
69	137
70	139
71	71
72	0
73	73
74	0
75	149
76	151
77	0

n	a(n)
1	0
2	2
3	3
4	7
5	5
6	11
7	7
8	0
9	17
10	19
11	11
12	23
13	13
14	0
15	29
16	31
17	17
18	0
19	19
20	0
21	41
22	43
23	23
24	47
25	0
26	0
27	53
28	0
29	29
30	59
31	31
32	0
33	0
34	67
35	0
36	71
37	37
38	0
39	0
40	79
41	41
42	83
43	43
44	0
45	89
46	0
47	47
48	0
49	97
50	0
51	101
52	103
53	53
54	107
55	109
56	0
57	113
58	0
59	59
60	0
61	61
62	0
63	0
64	127
65	0
66	131
67	67
68	0
69	137
70	139
71	71
72	0
73	73
74	0
75	149
76	151
77	0