133272domain: NAppears in sequencesConsider all 3 X 3 matrices M whose entries are the n-th to (n+8)-th primes prime(n), ..., prime(n+8), in any order. a(n) is the sum of the number of M such that det(M) is divisible by prime(n+i), for i from 0 to 8.at n=5A339105a(n) = Sum_{d|n} d * (n/d)^d.at n=23A359103