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A001348 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 536870911
11 2147483647
12 137438953471
13 2199023255551
14 8796093022207
15 140737488355327
16 9007199254740991
17 576460752303423487
18 2305843009213693951
19 147573952589676412927
20 2361183241434822606847

[3,7,31,127,2047,8191,131071,524287,8388607,
 536870911,2147483647,137438953471,2199023255551,
 8796093022207,140737488355327,9007199254740991,
 576460752303423487,2305843009213693951,
 147573952589676412927,2361183241434822606847]

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Last modified October 23 17:11 EDT 2014. Contains 248468 sequences.