3078361domain: NAppears in sequencesPseudoprimes to base 3 that are not squarefree.at n=28A244065Nonsquarefree numbers n = p_1^s_1...p_m^s_m (m > 1) such that (p_i^s_i - 1) | n-1 for all 0 < i <= m.at n=29A292815Pseudoprimes to base 3 that are not squarefree, including the non-coprime pseudoprimes.at n=30A306452