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A083420 as a simple table

n a(n)
0 1
1 7
2 31
3 127
4 511
5 2047
6 8191
7 32767
8 131071
9 524287
10 2097151
11 8388607
12 33554431
13 134217727
14 536870911
15 2147483647
16 8589934591
17 34359738367
18 137438953471
19 549755813887
20 2199023255551
21 8796093022207
22 35184372088831

[1,7,31,127,511,2047,8191,32767,131071,524287,
 2097151,8388607,33554431,134217727,536870911,
 2147483647,8589934591,34359738367,137438953471,
 549755813887,2199023255551,8796093022207,
 35184372088831]

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Last modified April 20 05:52 EDT 2014. Contains 240779 sequences.