81375

Appears in sequences

• a(n) = (1/12)*(n+5)*(n+1)*n^2.at n=30A014205
• Odd square pyramidal numbers.at n=31A015221
• a(n) = n*(n+1)*(6*n-5)/2.at n=30A172082
• Binomial(prime(n),s)/prime(n) where s is the sum of the decimal digits of n.at n=30A176266
• a(n) = n*(2*n + 1)*(4*n + 1)/3.at n=31A258582
• Multiplicities of 4-class association schemes.at n=19A326893
• a(n) is the smallest square pyramidal number with binary weight n.at n=13A359318
• a(n) = A276086(n)*A276086(sigma(n)-n) - A276086(sigma(n)), where A276086 is the primorial base exp-function, and sigma is the sum of divisors function.at n=38A388281