A242169 - cp's OEIS frontend

A242169 Least prime divisor of Fr(n) which does not divide any Fr(k) with k < n, or 1 if such a primitive prime divisor of Fr(n) does not exist, where Fr(n) denotes the n-th Franel number given by A000172.

n	a(n)
1	2
2	5
3	7
4	173
5	563
6	13
7	41
8	369581
9	937
10	61
11	23
12	29
13	2141
14	12148537
15	31
16	157
17	59
18	37
19	506251
20	151
21	3019
22	769
23	47
24	6730949
25	79
26	53
27	3853
28	661
29	138961158000728258971
30	1361
31	421
32	96920594213
33	51378681049
34	457
35	71

[2, 5, 7, 173, 563, 13, 41, 369581, 937, 61, 23, 29, 2141, 12148537, 31, 157, 59, 37, 506251, 151, 3019, 769, 47, 6730949, 79, 53, 3853, 661, 138961158000728258971, 1361, 421, 96920594213, 51378681049, 457, 71]

cp's OEIS Frontend

A242169 Least prime divisor of Fr(n) which does not divide any Fr(k) with k < n, or 1 if such a primitive prime divisor of Fr(n) does not exist, where Fr(n) denotes the n-th Franel number given by A000172.

Table of values

List of values