81317
domain: N
Appears in sequences
- Strong pseudoprimes to base 28.at n=21A020254
- Strong pseudoprimes to base 52.at n=26A020278
- Pentagonal numbers (A000326) that are also brilliant numbers (A078972).at n=13A113941
- Semiprimes of the form n*(3*n-1)/2.at n=27A245365
- Semiprimes of the form (4*n + 1)*(6*n + 1) = 24*n^2 + 10*n + 1.at n=10A255584