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A000668 as a simple table

n a(n)
1 3
2 7
3 31
4 127
5 8191
6 131071
7 524287
8 2147483647
9 2305843009213693951
10 618970019642690137449562111
11 162259276829213363391578010288127
12 170141183460469231731687303715884105727

[3,7,31,127,8191,131071,524287,2147483647,
 2305843009213693951,618970019642690137449562111,
 162259276829213363391578010288127,
 170141183460469231731687303715884105727]

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Last modified June 22 12:24 EDT 2017. Contains 288613 sequences.