

A127117


A sequence of binary numbers. The first number is 1. Thereafter each number a(n) is defined using the previous number a(n1) in the following way : a(n)=a(n1).b(n1) where the dot means the concatenation operation and b(n1) stands for the first number that is not present in a(n1), using the usual order (1, 10, 11, 100, 101, etc.).


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