A242173 - cp's OEIS frontend

A242173 Least prime divisor of the n-th central Delannoy number D(n) which does not divide any D(k) with k < n, or 1 if such a primitive prime divisor of D(n) does not exist.

n	a(n)
1	3
2	13
3	7
4	107
5	11
6	89
7	31
8	265729
9	19
10	9887
11	23
12	113
13	79
14	373
15	53
16	3089
17	151
18	127
19	719
20	193
21	43
22	482673878761
23	47
24	61403
25	109
26	37889
27	1223
28	3251609
29	59
30	181
31	22504880485262968151
32	3598831
33	67
34	69593
35	179
36	13828116559
37	4247285503
38	1579
39	19095283759
40	619

[3, 13, 7, 107, 11, 89, 31, 265729, 19, 9887, 23, 113, 79, 373, 53, 3089, 151, 127, 719, 193, 43, 482673878761, 47, 61403, 109, 37889, 1223, 3251609, 59, 181, 22504880485262968151, 3598831, 67, 69593, 179, 13828116559, 4247285503, 1579, 19095283759, 619]

cp's OEIS Frontend

A242173 Least prime divisor of the n-th central Delannoy number D(n) which does not divide any D(k) with k < n, or 1 if such a primitive prime divisor of D(n) does not exist.

Table of values

List of values