965177domain: NPropertiesPrimalityPrimeyesAppears in sequencesLeast number m such that the Sigma-Harmonic sequence Sum_{k=1..m} 1/sigma(k) >= n.at n=9A074468Beginning with 5, primes of the form: least multiple of the previous term followed by a 7. Beginning with 5, a(n) is the least prime of the form k*a(n-1)*10 +7.at n=4A113056Prime numbersat n=76006