A248579 - cp's OEIS frontend

A248579 a(n) = the smallest numbers k such that nT(k)-1 and nT(k)+1 are twin primes or 0 if no solution exists for n where T(k) = A000217(k) = k-th triangular number.

n	a(n)
1	3
2	2
3	3
4	1
5	3
6	1
7	3
8	0
9	0
10	2
11	12
12	1
13	11
14	2
15	4
16	5
17	3
18	1
19	12
20	2
21	24
22	6
23	3
24	2
25	3
26	12
27	4
28	5
29	20
30	1
31	27
32	3
33	3
34	2
35	11
36	2
37	56
38	3
39	7
40	3
41	32
42	1
43	44
44	5
45	3
46	2
47	3
48	11
49	12
50	2
51	7
52	3
53	15
54	5
55	20
56	14
57	4
58	3
59	32
60	1
61	27
62	6
63	8
64	2
65	8
66	2
67	11
68	5
69	7
70	3
71	167
72	1
73	20
74	9
75	12
76	2
77	3
78	18

[3, 2, 3, 1, 3, 1, 3, 0, 0, 2, 12, 1, 11, 2, 4, 5, 3, 1, 12, 2, 24, 6, 3, 2, 3, 12, 4, 5, 20, 1, 27, 3, 3, 2, 11, 2, 56, 3, 7, 3, 32, 1, 44, 5, 3, 2, 3, 11, 12, 2, 7, 3, 15, 5, 20, 14, 4, 3, 32, 1, 27, 6, 8, 2, 8, 2, 11, 5, 7, 3, 167, 1, 20, 9, 12, 2, 3, 18]

cp's OEIS Frontend

A248579 a(n) = the smallest numbers k such that nT(k)-1 and nT(k)+1 are twin primes or 0 if no solution exists for n where T(k) = A000217(k) = k-th triangular number.

Table of values

List of values

n	a(n)
1	3
2	2
3	3
4	1
5	3
6	1
7	3
8	0
9	0
10	2
11	12
12	1
13	11
14	2
15	4
16	5
17	3
18	1
19	12
20	2
21	24
22	6
23	3
24	2
25	3
26	12
27	4
28	5
29	20
30	1
31	27
32	3
33	3
34	2
35	11
36	2
37	56
38	3
39	7
40	3
41	32
42	1
43	44
44	5
45	3
46	2
47	3
48	11
49	12
50	2
51	7
52	3
53	15
54	5
55	20
56	14
57	4
58	3
59	32
60	1
61	27
62	6
63	8
64	2
65	8
66	2
67	11
68	5
69	7
70	3
71	167
72	1
73	20
74	9
75	12
76	2
77	3
78	18

n	a(n)
1	3
2	2
3	3
4	1
5	3
6	1
7	3
8	0
9	0
10	2
11	12
12	1
13	11
14	2
15	4
16	5
17	3
18	1
19	12
20	2
21	24
22	6
23	3
24	2
25	3
26	12
27	4
28	5
29	20
30	1
31	27
32	3
33	3
34	2
35	11
36	2
37	56
38	3
39	7
40	3
41	32
42	1
43	44
44	5
45	3
46	2
47	3
48	11
49	12
50	2
51	7
52	3
53	15
54	5
55	20
56	14
57	4
58	3
59	32
60	1
61	27
62	6
63	8
64	2
65	8
66	2
67	11
68	5
69	7
70	3
71	167
72	1
73	20
74	9
75	12
76	2
77	3
78	18

cp's OEIS Frontend

A248579 a(n) = the smallest numbers k such that n*T(k)-1 and n*T(k)+1 are twin primes or 0 if no solution exists for n where T(k) = A000217(k) = k-th triangular number.

Table of values

List of values

A248579 a(n) = the smallest numbers k such that nT(k)-1 and nT(k)+1 are twin primes or 0 if no solution exists for n where T(k) = A000217(k) = k-th triangular number.

n	a(n)
1	3
2	2
3	3
4	1
5	3
6	1
7	3
8	0
9	0
10	2
11	12
12	1
13	11
14	2
15	4
16	5
17	3
18	1
19	12
20	2
21	24
22	6
23	3
24	2
25	3
26	12
27	4
28	5
29	20
30	1
31	27
32	3
33	3
34	2
35	11
36	2
37	56
38	3
39	7
40	3
41	32
42	1
43	44
44	5
45	3
46	2
47	3
48	11
49	12
50	2
51	7
52	3
53	15
54	5
55	20
56	14
57	4
58	3
59	32
60	1
61	27
62	6
63	8
64	2
65	8
66	2
67	11
68	5
69	7
70	3
71	167
72	1
73	20
74	9
75	12
76	2
77	3
78	18