A377380 - cp's OEIS frontend

A377380 a(n) is the first positive number k such that k is alternately a quadratic residue and nonresidue modulo the first n primes, but not the n+1'th.

n	a(n)
1	1
2	2
3	11
4	41
5	26
6	5
7	671
8	89
9	59
10	1181
11	1991
12	3755
13	21521
14	34145
15	25994
16	137885
17	61106
18	1503029
19	2617439
20	1008551
21	2897081
22	22363295
23	33603926
24	36518450
25	79865294
26	185914490
27	593068985
28	2211452939
29	2120224529
30	1673286179
31	2644173521
32	1976870465

[1, 2, 11, 41, 26, 5, 671, 89, 59, 1181, 1991, 3755, 21521, 34145, 25994, 137885, 61106, 1503029, 2617439, 1008551, 2897081, 22363295, 33603926, 36518450, 79865294, 185914490, 593068985, 2211452939, 2120224529, 1673286179, 2644173521, 1976870465]

cp's OEIS Frontend

A377380 a(n) is the first positive number k such that k is alternately a quadratic residue and nonresidue modulo the first n primes, but not the n+1'th.

Table of values

List of values