247520

Appears in sequences

• a(n) = 5*(n+1)*binomial(n+2, 5)/2.at n=12A027778
• a(n) = 13*(n+1)*binomial(n+2,13)/2.at n=4A027786
• a(n) = binomial(n+3,3)*binomial(n+6,3).at n=11A105939
• Numbers k not divisible by 6 such that sigma(k) > 3*k.at n=19A126104
• Positive integers n such that n^2 = (x^4 - y^4)*(z^4 - t^4) where x>y and z>t are distinct pairs of integers with gcd(x,y)=gcd(z,t)=1.at n=20A147856
• 9-quantum transitions in systems of N >= 9 spin 1/2 particles, in columns by combination indices.at n=23A213351
• Denominators of the partial sums of the reciprocals of the sum of unitary divisors function (A034448).at n=29A379514