98021domain: NAppears in sequencesOdd square pyramidal numbers.at n=33A015221Numbers n such that n and n+-1 have 4 distinct prime factors.at n=28A168628a(n) = n*(2*n + 1)*(4*n + 1)/3.at n=33A258582a(n) is the smallest square pyramidal number with binary weight n.at n=12A359318