185869domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p with pi(p), pi(2*p), pi(3*p) and pi(4*p) all prime, where pi(x) denotes the number of primes not exceeding x.at n=2A240604Expansion of (H(-x) / chi(-x))^2 in powers of x where chi() is a Ramanujan theta function and G() is a Rogers-Ramanujan function.at n=36A261526Prime numbersat n=16823