A023519 - cp's OEIS frontend

A023519 Least odd prime divisor of prime(n)prime(n-1) - 1, or 1 if prime(n)prime(n-1) - 1 is a power of 2.

n	a(n)
1	1
2	5
3	7
4	17
5	19
6	71
7	5
8	7
9	109
10	3
11	449
12	3
13	379
14	881
15	5
16	3
17	3
18	7
19	3
20	29
21	2591
22	3
23	11
24	3
25	13
26	31
27	7
28	5
29	7
30	3079
31	5
32	4159
33	3
34	9521
35	5
36	7
37	3
38	3
39	5
40	3
41	3
42	97
43	5
44	7
45	5
46	17
47	3
48	3
49	5
50	7
51	13339
52	3
53	31
54	5
55	3
56	3
57	3
58	7
59	3
60	11
61	39761
62	11
63	5
64	23869
65	7
66	5
67	23
68	3
69	59
70	151
71	19
72	3
73	43
74	3
75	3
76	11
77	3
78	19
79	39799
80	13

[1, 5, 7, 17, 19, 71, 5, 7, 109, 3, 449, 3, 379, 881, 5, 3, 3, 7, 3, 29, 2591, 3, 11, 3, 13, 31, 7, 5, 7, 3079, 5, 4159, 3, 9521, 5, 7, 3, 3, 5, 3, 3, 97, 5, 7, 5, 17, 3, 3, 5, 7, 13339, 3, 31, 5, 3, 3, 3, 7, 3, 11, 39761, 11, 5, 23869, 7, 5, 23, 3, 59, 151, 19, 3, 43, 3, 3, 11, 3, 19, 39799, 13]

cp's OEIS Frontend

A023519 Least odd prime divisor of prime(n)prime(n-1) - 1, or 1 if prime(n)prime(n-1) - 1 is a power of 2.

Table of values

List of values

cp's OEIS Frontend

A023519 Least odd prime divisor of prime(n)*prime(n-1) - 1, or 1 if prime(n)*prime(n-1) - 1 is a power of 2.

Table of values

List of values

A023519 Least odd prime divisor of prime(n)prime(n-1) - 1, or 1 if prime(n)prime(n-1) - 1 is a power of 2.