a(n) is the smallest positive integer that cannot be obtained by using the number 2 at most n times and the operators +, -, *, /.
A071997
a(n) is the smallest positive integer that cannot be obtained by using the number 2 at most n times and the operators +, -, *, /.
Terms
- a(0) =1a(1) =3a(2) =5a(3) =7a(4) =11a(5) =19a(6) =27a(7) =43a(8) =75a(9) =115a(10) =171a(11) =307a(12) =555a(13) =691a(14) =1383a(15) =2467a(16) =3627a(17) =7243a(18) =10995a(19) =17587a(20) =28973a(21) =57943a(22) =87963a(23) =151133a(24) =267573a(25) =465293a(26) =807629a(27) =1407093a(28) =2390667a(29) =4216531
External references
- oeis: A071997