An arithmetic progression is a sequence where each term differs from its neighbors by a constant value. Thus, \( 1, 4, 7, 10, 13, \dots \) is an arithmetic progression with a common difference of \( 3 \).

If the initial term of an arithmetic progression is given by \( a_1\) and the common difference by \( d \), then the general term is:

\[ a_n = a_1 + (n-1)d .\]

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