33511

Appears in sequences

• Odd square pyramidal numbers.at n=23A015221
• a(n) = Sum_{k=1..phi(n)} k*t(k), where t(k) is the k-th positive integer which is coprime to n and phi(n) is the number of positive integers which are <= n and are coprime to n.at n=46A135324
• Ceiling(4/3*Pi*n^3).at n=20A135973
• Sum of the squared parts of the partitions of n into exactly two parts.at n=46A226141
• Number of blocks in a Steiner Quadruple System of order A047235(n+1).at n=30A228124
• a(n) = n*(2*n + 1)*(4*n + 1)/3.at n=23A258582