1335961

Appears in sequences

• Pseudoprimes to base 3 that are not squarefree.at n=19A244065
• Nonsquarefree 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=20A292815
• Pseudoprimes to base 3 that are not squarefree, including the non-coprime pseudoprimes.at n=21A306452
• a(n) is the numerator of the squared circumradius of a cyclic quadrilateral with sides n, n+1, n+2, n+3.at n=11A351696
• a(n) = (6*n + 1)*(12*n + 1)*(18*n + 1).at n=10A382809