67925domain: NAppears in sequencesa(n) = n*(n+1)*(n^2 + 2)/6.at n=25A071239Base-3 Keith numbers.at n=23A18819528-gonal pyramidal numbers: a(n) = n*(n+1)*(26*n-23)/6.at n=25A256648Number of positive integers with n digits whose digit sum is equal to its digit product.at n=25A297815