37727

Appears in sequences

• Expansion of (1-x)/(1-x-x^2+2*x^3).at n=45A078011
• Take a squarefree semiprime and take the difference of its prime factors. If it is a squarefree semiprime repeat the process. Sequence lists the squarefree semiprimes that generate other squarefree semiprimes only in the first k steps of this process. Case k = 5.at n=17A296812
• Column 2 of triangle A370041.at n=19A370155