A242241 - cp's OEIS frontend

A242241 Least prime p such that H(2,n) = sum_{k=1..n}1/k^2 == 0 (mod p) but there is no 0 < k < n with H(2,k) == 0 (mod p), or 1 if such a prime p does not exist.

n	a(n)
1	1
2	5
3	7
4	41
5	11
6	13
7	266681
8	17
9	19
10	178939
11	23
12	18500393
13	40799043101
14	29
15	31
16	619
17	601
18	8821
19	86364397717734821
20	421950627598601
21	2621
22	295831
23	47
24	2237
25	157
26	53
27	307
28	7741
29	6823
30	61
31	205883
32	487
33	67
34	21767149
35	71
36	73
37	149
38	2004383
39	79
40	34033

[1, 5, 7, 41, 11, 13, 266681, 17, 19, 178939, 23, 18500393, 40799043101, 29, 31, 619, 601, 8821, 86364397717734821, 421950627598601, 2621, 295831, 47, 2237, 157, 53, 307, 7741, 6823, 61, 205883, 487, 67, 21767149, 71, 73, 149, 2004383, 79, 34033]

cp's OEIS Frontend

A242241 Least prime p such that H(2,n) = sum_{k=1..n}1/k^2 == 0 (mod p) but there is no 0 < k < n with H(2,k) == 0 (mod p), or 1 if such a prime p does not exist.

Table of values

List of values