318551

Appears in sequences

• Pentagonal numbers (A000326) that are also brilliant numbers (A078972).at n=25A113941
• Overpseudoprimes to base 5.at n=16A141390
• Semiprimes of the form (4*n + 1)*(6*n + 1) = 24*n^2 + 10*n + 1.at n=18A255584