189223

Properties

Appears in sequences

• Number of ways that a tile in the form of a strip of n congruent regular hexagons stuck together on successive parallel edges can be surrounded by one layer of copies of itself in a plane. Ways that differ by rotation or reflection are not counted as different. The surrounded tile is the exact surrounded region.at n=11A159295
• Primes p such that p+2 is the square of a product of 3 distinct primes.at n=6A164519
• Primes of the form 9n^2 - 2.at n=28A201860
• Prime numbersat n=17097