60200domain: NAppears in sequencesa(n) = 2*a(n-1) + prime(n) - prime(n-1), a(1)=2, where prime(n) denotes the n-th prime.at n=14A125180Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 6.at n=24A136883Number of (w,x,y,z) with all terms in {1,...,n} and w > |x-y| + |y-z|.at n=20A212674