250717

Appears in sequences

• Expansion of (1 - 2x)/(1 - 2x - x^2 - x^3 + 2x^4).at n=16A052974
• Pentagonal numbers (A000326) that are also brilliant numbers (A078972).at n=22A113941
• Pentagonal numbers for which both the sum of the digits and the product of the digits are pentagonal numbers.at n=24A117711
• Semiprimes of the form n*(3*n-1)/2.at n=38A245365
• Semiprimes of the form (4*n + 1)*(6*n + 1) = 24*n^2 + 10*n + 1.at n=15A255584