105901domain: NAppears in sequencesG.f.: (1 + x^3 + x^4 + ... + x^12 + x^15)/Product_{i=1..10} (1 - x^i).at n=42A003403a(n) = prime(n) * prime(prime(n)).at n=32A073065Product of twin-prime-indexed primes and their lower bound twin prime.at n=10A080698