31297

Appears in sequences

• Sum of digits in n-th term of A022482.at n=32A022487
• Numbers k such that 89*2^k+1 is prime.at n=13A032394
• Binomial transform of (1,0,1,0,1,0,2,0,2,0,2,0,...).at n=15A084636
• Numbers n such that 4*10^n + R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=18A102981
• Antidiagonal triangle sequence based on recursion: f(n,a)=a*n*f(n-1,a)+f(n-2,a).at n=41A173003
• G.f.: exp( Sum_{n>=1} (Sum_{d|n} d*x^d)^n/n ).at n=15A192860
• Triangle read by rows: T(n,k) is the number of secondary structures of size n having k stacks of length 3.at n=49A202843
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x+263)^2 = y^2.at n=9A207058
• Number of inequivalent (mod D_3) ways to place 3 points on a triangular grid of side n so that they are not vertices of an equilateral triangle with sides parallel to the grid.at n=12A243208
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 577", based on the 5-celled von Neumann neighborhood.at n=32A273024