22857

Appears in sequences

• Number of terms in n-th derivative of a function composed with itself 9 times.at n=8A024209
• Matrix 9th power of partition triangle A008284.at n=28A050303
• Terms in the decimal expansion of 1/(7*5^n) before the block of decimals 142857 (the period of 1/7) appears.at n=3A067703
• Numbers of the form 56+p^2 (where p is a prime).at n=35A138690
• Expansion of g.f.: (1 + x^2 - x^3)/(1 - x - x^2 + x^3 - x^5).at n=28A147604
• Number of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,0 4,0 polyhexes in any orientation on a planar nXnXn triangular grid.at n=6A155271
• Numbers k such that the sum of the prime distinct divisors of k^2+1 equals 2 times the largest prime divisor of k^2+1.at n=6A200072
• Number of (w,x,y) with all terms in {0,...,n} and w < range{w,x,y}.at n=37A212967
• Related to Fibonacci numbers, see the Formula section.at n=33A215082
• a(n) = A215082(2*n+1).at n=16A215109
• Number of terms in 8th derivative of a function composed with itself n times.at n=8A215626
• Difference between the smallest 10^n-digit member of a cousin prime pair and 10^(10^n - 1).at n=2A239006
• Number of weakly connected acyclic digraphs with n arcs.at n=8A350451
• Number of regions among all distinct circles that can be constructed from a 2 X n square grid of points using only a compass.at n=8A359860
• a(n) = sum of the first n primes whose distance to next prime is 4.at n=44A360226