A125193 - cp's OEIS frontend

A125193 Smallest prime p such that p^2 divides the numerator of generalized harmonic number H((p-1)/2,2n) = Sum[ 1/k^(2n), {k,1,(p-1)/2} ].

n	a(n)
1	7
2	31
3	127
4	7
5	5
6	8191
7	7
8	2591
9	149
10	7
11	11
12	31
13	7
14	7
15	5
16	7
17	17
18	223
19	7
20	37
21	431
22	7
23	23
24	127
25	5
26	13
27	23
28	7
29	29
30	547
31	7
32	31
33	11
34	7
35	5
36	59
37	7
38	19
39	13
40	7
41	41
42	31
43	7
44	11
45	5
46	7
47	31
48	2371
49	7

[7, 31, 127, 7, 5, 8191, 7, 2591, 149, 7, 11, 31, 7, 7, 5, 7, 17, 223, 7, 37, 431, 7, 23, 127, 5, 13, 23, 7, 29, 547, 7, 31, 11, 7, 5, 59, 7, 19, 13, 7, 41, 31, 7, 11, 5, 7, 31, 2371, 7]

cp's OEIS Frontend

A125193 Smallest prime p such that p^2 divides the numerator of generalized harmonic number H((p-1)/2,2n) = Sum[ 1/k^(2n), {k,1,(p-1)/2} ].

Table of values

List of values