42727

Properties

Appears in sequences

• 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=20A247905
• Primes having only {2, 4, 7} as digits.at n=22A385784
• Prime numbersat n=4468