Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §10.1 The Geometric Series, #9 · Calculus · Series
From the fact that every … goes evenly into a power …
From the fact that every goes evenly into a power minus a smaller power, show that all primes except 2 or 5 go evenly into 9 or 99 or 999 or .
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §10.1 The Geometric Series, #9
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