340791

Appears in sequences

• If p(x) is the x-th prime, then the n-th set of 5 consecutive sexy prime pairs starts at p(a(n)).at n=24A095964
• If p(x) is the x-th prime, then the n-th set of 6 consecutive sexy prime pairs starts at p(a(n)).at n=2A095965
• Number of tilings of an equilateral triangle of side length n with unit triangles (of side length 1) and exactly two unit "lozenges" or "diamonds" (also of side length 1).at n=23A326367
• a(n) = (1/(2*n+1)) * Sum_{k=0..n} (k+1)^3 * (2*k+1) * binomial(3*n-k,n-k).at n=7A390969