272400599domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = largest m such that the harmonic number H(m)= Sum_{i=1..m} 1/i is < n.at n=19A1155151 followed by the union of the terms > 2 in A002387 (or A004080) and A115515.at n=37A242654Prime numbersat n=14834839