1229305

Appears in sequences

• Area ar/6 (divided by 6) of primitive Pythagorean triangles such that perimeters are Averages of twin prime pairs, q=p+1, a=q^2-p^2, c=q^2+p^2, b=2*p*q, ar=a*b/2; s=a+b+c, s-+1 are primes.at n=16A155177
• Expansion of 1/(1 - x^6/(1-x)^7).at n=22A369809
• a(n) = Sum_{k=0..floor(n/2)} binomial(k+1,3*n-6*k+1).at n=47A392673