A138244 a(1)=1; for n>1, a(n) = smallest integer > a(n-1) such that a(n) is coprime to (a(k)-a(k-1)) for all k, 2<=k<=n and such that (a(n)-a(n-1)) doesn't equal (a(k)-a(k-1)) for any k, 2<=k<=n-1.

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