140097domain: NAppears in sequencesNon-coprime pseudoprimes or primes to base 3: numbers k that are multiples of 3 and are such that k divides 3^k - 3.at n=10A306451Expansion of Product_{k>0} (1 + x^k/(1 + x^k/(1 + x^k))).at n=19A327684