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All infinite techs except Mining Productivity and Follower Count use a formula doubling the cost every rank.
count_formula = "2^(L-x)*1000"

Mining productivity research cost deviates massively from other inf techs increasing cost only by 100 per rank.
count_formula = "100(L-1)"

Follower count research cost also increases only by 100 per rank.
count_formula = "100(L-6)+900"

Is it intended to have these two techs basically remaining the same price while all others have exponential cost increase?

Optera wrote:Is it intended to have these two techs basically remaining the same price while all others have exponential cost increase?

Yes

In fact, mining productivity cost grows at the same rate the bonus grows. So each level costs exactly the same in terms of raw resources.