21243690

Appears in sequences

• Number of sublattices of index n in generic 6-dimensional lattice.at n=28A038993
• a(n) = 111111 in base n.at n=28A053700
• a(n) = 1 + prime(n) + prime(n)^2 + prime(n)^3 + prime(n)^4 + prime(n)^5.at n=9A131993
• a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 7.at n=28A160895
• a(n) = sigma(n^5).at n=28A203556
• a(n) = (29^n - 1)/28.at n=6A218732