The Jacobsthal-Lucas sequence is formed with the formula
The first numbers are
2,
1,
5,
7,
17,
31,
65,
127,
257,
511,
1025,
2047,
4097,
8191,
16385,
32767,
65537,
131071,
262145,
524287,
1048577,
2097151,
4194305,
8388607,
16777217,
33554431,
67108865,
134217727,
268435457,
536870911,
1073741825,
2147483647,
4294967297,
8589934591