Title: The Frobenius problem for four numerical semigroups,
Abstract: The greatest integer that does not belong to a numerical semigroup $S$ is
called the Frobenius number of $S$ and finding the Frobenius number is called
the Frobenius problem. In this paper, we introduce the Frobenius problem for
numerical semigroups generated by Thabit number base b and Thabit number of the
second kind base b which are motivated by the Frobenius problem for Thabit
numerical semigroups. Also, we introduce the Frobenius problem for numerical
semigroups generated by Cunningham number and Fermat number base $b$