40269domain: NAppears in sequencesNumbers n such that n through n+6 are divisible by the same number of distinct primes.at n=18A045935a(n+3) = floor( ( a(n) + 2*a(n+1) + 3*a(n+2) )/4 ), with a(0), a(1), a(2) equal to 0, 1, 2.at n=44A074732