34229

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers), t = (primes).at n=37A024604
• Least positive integer m with prime(m)+2 and prime(prime(m))+2 both prime such that prime(m*n)+2 and prime(prime(m*n))+2 are both prime.at n=21A259487
• Number of regions after generation n of Conant's dissection of a square when dissected with diagonal lines and where the starting pair of edges rotates counterclockwise around the square.at n=18A335093
• a(n) is the number of reducible monic quintic polynomials (x^5 + r*x^4 + s*x^3 + t*x^2 + u*x + v) with integer coefficients bounded by naïve height n (abs(r), abs(s), abs(t), abs(u), abs(v) <= n).at n=4A358400
• Semiprimes of the form k^2 + 4.at n=41A360741