A248580 - cp's OEIS frontend

A248580 a(n) = the smallest triangular number T(k) such that nT(k)-1 and nT(k)+1 are twin primes or 0 if no solution exists for n; T(k) = A000217(k) = k-th triangular number.

n	a(n)
1	6
2	3
3	6
4	1
5	6
6	1
7	6
8	0
9	0
10	3
11	78
12	1
13	66
14	3
15	10
16	15
17	6
18	1
19	78
20	3
21	300
22	21
23	6
24	3
25	6
26	78
27	10
28	15
29	210
30	1
31	378
32	6
33	6
34	3
35	66
36	3
37	1596
38	6
39	28
40	6
41	528
42	1
43	990
44	15
45	6
46	3
47	6
48	66
49	78
50	3
51	28
52	6
53	120
54	15
55	210
56	105
57	10
58	6
59	528
60	1
61	378
62	21
63	36
64	3
65	36
66	3
67	66
68	15
69	28
70	6

[6, 3, 6, 1, 6, 1, 6, 0, 0, 3, 78, 1, 66, 3, 10, 15, 6, 1, 78, 3, 300, 21, 6, 3, 6, 78, 10, 15, 210, 1, 378, 6, 6, 3, 66, 3, 1596, 6, 28, 6, 528, 1, 990, 15, 6, 3, 6, 66, 78, 3, 28, 6, 120, 15, 210, 105, 10, 6, 528, 1, 378, 21, 36, 3, 36, 3, 66, 15, 28, 6]

cp's OEIS Frontend

A248580 a(n) = the smallest triangular number T(k) such that nT(k)-1 and nT(k)+1 are twin primes or 0 if no solution exists for n; T(k) = A000217(k) = k-th triangular number.

Table of values

List of values

cp's OEIS Frontend

A248580 a(n) = the smallest triangular number T(k) such that n*T(k)-1 and n*T(k)+1 are twin primes or 0 if no solution exists for n; T(k) = A000217(k) = k-th triangular number.

Table of values

List of values

A248580 a(n) = the smallest triangular number T(k) such that nT(k)-1 and nT(k)+1 are twin primes or 0 if no solution exists for n; T(k) = A000217(k) = k-th triangular number.