1439425

Appears in sequences

• Pseudoprimes to base 7 that are not squarefree.at n=28A243089
• 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=21A292815