22821

Appears in sequences

• Numbers k such that 3*2^k - 7 is prime.at n=36A059747
• Expansion of exp(3*x) - exp(x)*(1-BesselI_0(2*x)).at n=9A081673
• Column 2 of triangle A128545; a(n) is the coefficient of q^(2n+4) in the central q-binomial coefficient [2n+4,n+2].at n=17A128552
• Sums of Pythagorean sextuples in increasing order: The sums of sets of six natural numbers which correspond to the lengths of the edges of a tetrahedron whose four faces are all different Pythagorean triangles.at n=40A248548
• Partial sums of A255744.at n=26A255765
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 515", based on the 5-celled von Neumann neighborhood.at n=28A272707
• Numerators of the convergents given by treating A072193 as continued fraction coefficients after the leading 0.at n=11A391714