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Let k be a field of characteristic zero. Given an ordered 3-tuple of positiveintegers a=(a,b,c) and for j in N, a family of sequences a_j = (j,a+j,a+b+j,a+b+c+j), we consider the collection of monomial curves in A^{4} associatedwith a_j. The Betti numbers of the Semigroup rings collection associated witha_j are conjectured to be eventually periodic with period a+b+c by Herzog andSrinivasan. Let p in N, in this paper, we prove that for a = (p(b+c),b, c) or a= (a, b, p(a+b)) in the collection of defining ideals associated with a_j, forlarge j the ideals are complete intersections if and only if (a + b + c)|j.Moreover, the complete intersections are periodic with the conjectured period.

On the perodicity of the first Betti number of the semigroup rings under translations