Each term of the sequence is the smallest positive integer that is coprime to all earlier terms and that has a different prime signature than all earlier terms. (a(1)=1.)

A175231

Each term of the sequence is the smallest positive integer that is coprime to all earlier terms and that has a different prime signature than all earlier terms. (a(1)=1.)

Terms

    a(0) =1a(1) =2a(2) =9a(3) =35a(4) =1331a(5) =2873a(6) =12673a(7) =923521a(8) =2076773a(9) =4084441a(10) =10109591a(11) =27433619a(12) =3939040643a(13) =6085997377a(14) =10930463309a(15) =15088854631a(16) =37920198353a(17) =68248399103a(18) =152574439967

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