21333

Appears in sequences

• Numbers k such that 71*2^k+1 is prime.at n=22A032385
• Number of subtraction steps in n-th interval between special points in Recamán's sequence A005132.at n=18A065055
• Nonnegative k such that 3*k + 1 is a perfect cube.at n=13A121628
• Number of partitions of n into parts with at most one part not greater than 2.at n=49A121659
• a(n) = floor(n^3/3).at n=40A131476
• a(n) = A008893(n)/2.at n=12A152041
• a(n) = A168174(n)-10^12.at n=26A168248
• Least magic constant of magic squares using Smith numbers.at n=9A170928
• Number of (w,x,y) with all terms in {0,...,n} and 2*w < |x+y-w|.at n=39A213396
• Expansion of Product_{k>=1} ((1+x^(3*k-1))*(1+x^(3*k-2)))^k.at n=39A262884
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 486", based on the 5-celled von Neumann neighborhood.at n=7A272507
• Number of ways to tile an n X n X n triangular area with two 2 X 2 X 2 triangular tiles and an appropriate number (= n^2-8) of 1 X 1 X 1 tiles.at n=13A286437
• Number of compositions of n whose standard factorization into Lyndon words has all weakly increasing factors.at n=16A299026
• Numbers that are the sum of eight fourth powers in nine or more ways.at n=20A345584
• Numbers that are the sum of eight fourth powers in ten or more ways.at n=9A345585
• Numbers that are the sum of eight fourth powers in exactly ten ways.at n=7A345842