136928

Appears in sequences

• a(n+1) = a(n) converted to base 8 from base 5 (written in base 10).at n=10A023381
• Structured octagonal anti-diamond numbers (vertex structure 7).at n=31A100187
• 27-gonal pyramidal numbers: a(n) = n*(n+1)*(25*n-22)/6.at n=32A256647
• Draw a regular n-gon and the enclosing circle, then for each pair of vertices X, Y, draw a circle with diameter XY; the union of these figures is the graph H_n; sequence gives number of regions in H_n.at n=30A370978