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Let a(1),a(2),a(3),....,a(100) be an ari...

Let `a_(1),a_(2),a_(3),....,a_(100)` be an arithmetic progression with `a_(1) = 3 and S_(p) = sum_(i=1)^(p) a_(i), 1 le p le 100`. For any integer n with `1 le n le 20`, let `m = 5n`. If `(S_(m))/(S_(n))` does not depend on n, then `a_(2)` is

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