71603domain: NAppears in sequencesColumn 4 of triangle A123610.at n=10A123614Composite squarefree numbers n such that p-d(n) divides n-d(n), where p are the prime factors of n and d(n) the number of divisors of n.at n=24A228300Main diagonal of Ludic array A255127 (and A255129): a(n) = A255127(n,n).at n=39A255410