90407

Properties

Appears in sequences

• Number of composites <= 10^n.at n=5A065894
• 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=9A159295
• Number of 2 X 2 nonsingular 0..n matrices with rows and columns in increasing order.at n=21A183762
• Numbers n that have record value of prime p such that p + 2n is another prime.at n=19A239392
• Primes equal to a centered triangular number plus 1.at n=38A285809
• Positions of records in A204911.at n=23A317249
• Prime numbersat n=8755