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A081093 as a simple table

n a(n)
1 3
2 7
3 31
4 127
5 3583
6 8191
7 131071
8 524287
9 14680063
10 1073479679
11 2147483647
12 266287972351
13 4260607557631
14 17591112302591
15 246290604621823
16 17996806323437567
17 1152917106560335871
18 2305843009213693951

[3,7,31,127,3583,8191,131071,524287,14680063,
 1073479679,2147483647,266287972351,4260607557631,
 17591112302591,246290604621823,17996806323437567,
 1152917106560335871,2305843009213693951]

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Last modified October 23 00:52 EDT 2014. Contains 248411 sequences.