29787

Appears in sequences

• n^3*a(n) is the number of circles in complex projective plane tangent to three smooth curves of degree n in general position.at n=29A030653
• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 6 (most significant digit on right).at n=14A061935
• a(n) = least k such that the remainder when 31^k is divided by k is n.at n=3A128371
• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.at n=18A146907
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 0, -1), (0, 1, 1), (1, 0, 1)}.at n=8A150479
• Partial sums of Sum_{k=1..n} n/gcd(n,k), or partial sums of Sum_{d|n} d*phi(d) (see A057660).at n=48A174405
• Number of 0..n arrays x(0..6) of 7 elements with zero 5th differences.at n=17A200085
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 590", based on the 5-celled von Neumann neighborhood.at n=14A283177
• If x^2 + 2*y^2 is prime for all positive integers x and y with m = x*y then m is in the sequence.at n=13A287799
• Number of nX4 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=20A317769
• Semiprimes A001358(k) = p*q such that p*q+p+q and r*s+r+s are consecutive primes, where A001358(k+1)=r*s.at n=10A330478
• Number of fixed polyominoids with n cells, allowing flat corner-connections and right-angled edge-connections.at n=4A365996