a(1)=1; thereafter, a(n+1) = a(n) + 2^(prime(n)-1).
A080355
a(1)=1; thereafter, a(n+1) = a(n) + 2^(prime(n)-1).
Terms
- a(0) =1a(1) =3a(2) =7a(3) =23a(4) =87a(5) =1111a(6) =5207a(7) =70743a(8) =332887a(9) =4527191a(10) =272962647a(11) =1346704471a(12) =70066181207
External references
- oeis: A080355