84271

Appears in sequences

• Quasi-Carmichael numbers to base -9: squarefree composites n such that prime p|n ==> p+9|n+9.at n=6A029569
• Binomial transform of {b(n)}, where b(n)=1 for prime n and b(n)=0 otherwise.at n=18A052467
• Absolute discriminants of imaginary quadratic number fields with elementary bicyclic 5-class group (5,5).at n=26A359871