A246556 - cp's OEIS frontend

A246556 a(n) = smallest prime which divides Pell(n) = A000129(n) but does not divide any Pell(k) for k or -1 if no such prime exists.

n	a(n)
2	2
3	5
4	3
5	29
6	7
7	13
8	17
9	197
10	41
11	5741
12	11
13	33461
14	239
15	269
16	577
17	137
18	199
19	37
20	19
21	45697
22	23
23	229
24	1153
25	1549
26	79
27	53
28	113
29	44560482149
30	31
31	61
32	665857
33	52734529
34	103
35	1800193921
36	73
37	593
38	9369319
39	389
40	241
41	1746860020068409
42	4663
43	11437
44	43
45	6481
46	47
47	3761
48	97
49	293
50	45245801
51	101
52	22307
53	68480406462161287469
54	7761799
55	109
56	1535466241

[2, 5, 3, 29, 7, 13, 17, 197, 41, 5741, 11, 33461, 239, 269, 577, 137, 199, 37, 19, 45697, 23, 229, 1153, 1549, 79, 53, 113, 44560482149, 31, 61, 665857, 52734529, 103, 1800193921, 73, 593, 9369319, 389, 241, 1746860020068409, 4663, 11437, 43, 6481, 47, 3761, 97, 293, 45245801, 101, 22307, 68480406462161287469, 7761799, 109, 1535466241]

cp's OEIS Frontend

A246556 a(n) = smallest prime which divides Pell(n) = A000129(n) but does not divide any Pell(k) for k or -1 if no such prime exists.

Table of values

List of values