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A121620 as a simple table

n a(n)
1 3
2 7
3 31
4 127
5 313968931
6 8191
7 131071
8 524287
9 777809294098524691
10 68629840493971
11 2147483647
12 114867606414015793728780533209145917205659365404867510184121
13 44487435359130133495783012898708551
14 1136791005963704961126617632861 

[3,7,31,127,313968931,8191,131071,524287,
 777809294098524691,68629840493971,2147483647,
 11486760641401579372878053320914591720565936540486\
 7510184121,44487435359130133495783012898708551,
 1136791005963704961126617632861]

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Last modified June 15 16:36 EDT 2024. Contains 373410 sequences. (Running on oeis4.)