Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §6.4 Logarithms, #74 · Calculus · Differentiation rules

Estimate …, the fraction of numbers near 90,000 that are prime

Estimate $1/ ln 90, 000$ , the fraction of numbers near 90,000 that are prime. (879 of the next 10,000 numbers are actually prime.)

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §6.4 Logarithms, #74

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