A380831 - cp's OEIS frontend

A380831 Numbers k such that k^(k + 1) == k + 1 (mod 2k + 1) while 2k+1 is not prime.

n	a(n)
1	1023
2	1638
3	14670
4	21399
5	24570
6	40290
7	44178
8	45375
9	52326
10	98046
11	128499
12	135975
13	157410
14	229494
15	244998
16	257223
17	370875
18	400302
19	419430
20	436590
21	458163
22	502326
23	625974
24	686826
25	754854
26	839270
27	905786
28	993510
29	1102983
30	1134546
31	1142226
32	1152083
33	1193898
34	1373238
35	1374011

[1023, 1638, 14670, 21399, 24570, 40290, 44178, 45375, 52326, 98046, 128499, 135975, 157410, 229494, 244998, 257223, 370875, 400302, 419430, 436590, 458163, 502326, 625974, 686826, 754854, 839270, 905786, 993510, 1102983, 1134546, 1142226, 1152083, 1193898, 1373238, 1374011]

cp's OEIS Frontend

A380831 Numbers k such that k^(k + 1) == k + 1 (mod 2k + 1) while 2k+1 is not prime.

Table of values

List of values

cp's OEIS Frontend

A380831 Numbers k such that k^(k + 1) == k + 1 (mod 2*k + 1) while 2*k+1 is not prime.

Table of values

List of values

A380831 Numbers k such that k^(k + 1) == k + 1 (mod 2k + 1) while 2k+1 is not prime.