91018

Appears in sequences

• Numbers k such that 1000k+1, 1000k+3, 1000k+7, 1000k+9 are all primes.at n=34A064962
• Number of partitions of n^2 into powers of 2.at n=13A196880
• Place two n-gons with radii 1 and 2 concentrically, forming an annular area between them. Connect all the vertices with line segments that lie entirely within that area. Then a(n) is the number of edges in that figure.at n=31A337702