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A006515 as a simple table

n a(n)
1 3
2 7
3 31
4 127
5 2047
6 8191
7 131071
8 524287
9 8388607
10 2147483647
11 137438953471
12 2199023255551
13 576460752303423487
14 2305843009213693951
15 147573952589676412927

[3,7,31,127,2047,8191,131071,524287,8388607,
 2147483647,137438953471,2199023255551,
 576460752303423487,2305843009213693951,
 147573952589676412927]

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Last modified December 8 19:01 EST 2016. Contains 278948 sequences.