46774domain: NAppears in sequencesa(n) is the start of the first run of exactly n consecutive numbers not of the form x^2 + x*y + y^2.at n=25A357020Products k of 4 distinct primes (or tetraprimes) such that none of k-2, k-1, k+1 and k+2 is squarefree.at n=30A364766