171703

Appears in sequences

• Number of positive integers <= 2^n of form 5 x^2 + 7 y^2.at n=21A054177
• Start with a single hexagon; at n-th generation add a hexagon at each expandable vertex (this is the "vertex to side" version); a(n) is the sum of all label values at n-th generation. (See comment for construction rules.)at n=24A247905