112871

Appears in sequences

• Quasi-Carmichael numbers to base -9: squarefree composites n such that prime p|n ==> p+9|n+9.at n=8A029569
• Squarefree conductors of quintic fields.at n=26A085715
• Partial sums of A100119. Sum of first n of the n-th centered n-gonal numbers.at n=30A130218
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y<=2z.at n=21A212507
• A fourth-order linear divisibility sequence: a(n) := (1/9)*(2^n + (-1)^n)*(2^(3*n) - (-1)^n).at n=4A238539