513590

Appears in sequences

• Sum_{k=1..n} (k(k+1))^2/2.at n=20A086755
• 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=15A155177
• a(n) = binomial(n+3, 3)*(1 + binomial(n+2, 3)/4).at n=19A291288
• Square array read by antidiagonals: row n lists n-gonal pyramidal numbers that are products of smaller n-gonal pyramidal numbers.at n=12A374498
• Square pyramidal numbers that are products of smaller square pyramidal numbers.at n=2A374500