51340

Appears in sequences

• Least k such that first k terms of A022303 contain n more 2's than 1's.at n=37A025518
• Triangle read by rows: T(n,k) = is the number of directed column-convex polyominoes of area n having along the lower contour exactly k reentrant corners, i.e., a vertical step that is followed by a horizontal step (n >= 1, k >= 0).at n=52A121466
• Numbers k such that k+1, k+3, k+7 and k+9 are all primes.at n=25A125855
• a(n) = 36*n^2 - 17*n + 2.at n=37A157265
• G.f.: A(x) = Sum_{n>=0} x^n / Product_{k=1..n} (1 - k*x^k).at n=21A193196
• a(n) = a(n-1) + a(n-2) + a(n-3), with a(0)=1, a(1)=4, a(2)=5.at n=17A354080
• Numbers that can be written as the product of two divisors greater than 1 such that the number is contained in the string concatenation of the divisors.at n=42A355790
• Number of compositions (ordered partitions) of n into tetranacci numbers 1,2,4,8,15,29, ... (A000078).at n=20A357453
• G.f. satisfies A(x) = 1 + x*A(x)^2 * (1 + x*A(x)^2)^3.at n=7A367285