Start with {2} and close under the operations XY and XY+1; sequence gives complete list of numbers that do not appear.

A093906

Start with {2} and close under the operations XY and XY+1; sequence gives complete list of numbers that do not appear.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =7a(4) =12a(5) =13a(6) =14a(7) =15a(8) =24a(9) =27a(10) =28a(11) =29a(12) =30a(13) =31a(14) =48a(15) =49a(16) =54a(17) =57a(18) =58a(19) =59a(20) =60a(21) =61a(22) =62a(23) =63a(24) =97a(25) =98a(26) =108a(27) =109a(28) =114a(29) =117

External references